mirror of
git://source.winehq.org/git/wine.git
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650 lines
17 KiB
C
650 lines
17 KiB
C
/*
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* Server-side thread management
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*
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* Copyright (C) 1998 Alexandre Julliard
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*/
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#include "config.h"
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#include <assert.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include "winbase.h"
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#include "winerror.h"
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#include "handle.h"
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#include "process.h"
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#include "thread.h"
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#include "request.h"
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/* thread queues */
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struct wait_queue_entry
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{
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struct wait_queue_entry *next;
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struct wait_queue_entry *prev;
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struct object *obj;
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struct thread *thread;
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};
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struct thread_wait
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{
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int count; /* count of objects */
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int flags;
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struct timeval timeout;
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struct timeout_user *user;
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struct wait_queue_entry queues[1];
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};
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/* asynchronous procedure calls */
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struct thread_apc
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{
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void *func; /* function to call in client */
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void *param; /* function param */
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};
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#define MAX_THREAD_APC 16 /* Max outstanding APCs for a thread */
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/* thread operations */
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static void dump_thread( struct object *obj, int verbose );
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static int thread_signaled( struct object *obj, struct thread *thread );
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static void destroy_thread( struct object *obj );
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static const struct object_ops thread_ops =
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{
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sizeof(struct thread),
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dump_thread,
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add_queue,
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remove_queue,
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thread_signaled,
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no_satisfied,
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no_read_fd,
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no_write_fd,
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no_flush,
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no_get_file_info,
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destroy_thread
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};
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static struct thread *first_thread;
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/* allocate the buffer for the communication with the client */
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static int alloc_client_buffer( struct thread *thread )
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{
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int fd;
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if ((fd = create_anonymous_file()) == -1) return -1;
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if (ftruncate( fd, MAX_REQUEST_LENGTH ) == -1) goto error;
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if ((thread->buffer = mmap( 0, MAX_REQUEST_LENGTH, PROT_READ | PROT_WRITE,
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MAP_SHARED, fd, 0 )) == (void*)-1) goto error;
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return fd;
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error:
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file_set_error();
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if (fd != -1) close( fd );
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return -1;
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}
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/* create a new thread */
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static struct thread *create_thread( int fd, struct process *process, int suspend )
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{
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struct thread *thread;
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int buf_fd;
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if (!(thread = alloc_object( &thread_ops ))) return NULL;
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thread->client = NULL;
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thread->unix_pid = 0; /* not known yet */
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thread->teb = NULL;
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thread->mutex = NULL;
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thread->debug_ctx = NULL;
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thread->debug_first = NULL;
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thread->debug_event = NULL;
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thread->wait = NULL;
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thread->apc = NULL;
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thread->apc_count = 0;
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thread->error = 0;
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thread->state = STARTING;
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thread->exit_code = 0x103; /* STILL_ACTIVE */
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thread->next = NULL;
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thread->prev = NULL;
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thread->priority = THREAD_PRIORITY_NORMAL;
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thread->affinity = 1;
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thread->suspend = (suspend != 0);
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thread->buffer = (void *)-1;
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thread->last_req = REQ_GET_THREAD_BUFFER;
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if (!first_thread) /* creating the first thread */
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{
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current = thread;
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thread->process = process = create_initial_process();
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assert( process );
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}
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else thread->process = (struct process *)grab_object( process );
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if ((thread->next = first_thread) != NULL) thread->next->prev = thread;
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first_thread = thread;
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add_process_thread( process, thread );
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if ((buf_fd = alloc_client_buffer( thread )) == -1) goto error;
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if (!(thread->client = add_client( fd, thread )))
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{
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close( buf_fd );
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goto error;
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}
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set_reply_fd( thread, buf_fd ); /* send the fd to the client */
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send_reply( thread );
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return thread;
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error:
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remove_process_thread( process, thread );
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release_object( thread );
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return NULL;
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}
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/* create the initial thread and start the main server loop */
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void create_initial_thread( int fd )
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{
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create_thread( fd, NULL, 0 );
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select_loop();
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}
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/* destroy a thread when its refcount is 0 */
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static void destroy_thread( struct object *obj )
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{
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struct thread *thread = (struct thread *)obj;
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assert( obj->ops == &thread_ops );
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assert( !thread->debug_ctx ); /* cannot still be debugging something */
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release_object( thread->process );
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if (thread->next) thread->next->prev = thread->prev;
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if (thread->prev) thread->prev->next = thread->next;
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else first_thread = thread->next;
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if (thread->apc) free( thread->apc );
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if (thread->buffer != (void *)-1) munmap( thread->buffer, MAX_REQUEST_LENGTH );
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}
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/* dump a thread on stdout for debugging purposes */
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static void dump_thread( struct object *obj, int verbose )
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{
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struct thread *thread = (struct thread *)obj;
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assert( obj->ops == &thread_ops );
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fprintf( stderr, "Thread pid=%d teb=%p state=%d\n",
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thread->unix_pid, thread->teb, thread->state );
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}
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static int thread_signaled( struct object *obj, struct thread *thread )
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{
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struct thread *mythread = (struct thread *)obj;
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return (mythread->state == TERMINATED);
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}
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/* get a thread pointer from a thread id (and increment the refcount) */
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struct thread *get_thread_from_id( void *id )
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{
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struct thread *t = first_thread;
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while (t && (t != id)) t = t->next;
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if (t) grab_object( t );
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return t;
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}
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/* get a thread from a handle (and increment the refcount) */
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struct thread *get_thread_from_handle( int handle, unsigned int access )
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{
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return (struct thread *)get_handle_obj( current->process, handle,
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access, &thread_ops );
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}
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/* set all information about a thread */
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static void set_thread_info( struct thread *thread,
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struct set_thread_info_request *req )
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{
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if (req->mask & SET_THREAD_INFO_PRIORITY)
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thread->priority = req->priority;
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if (req->mask & SET_THREAD_INFO_AFFINITY)
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{
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if (req->affinity != 1) set_error( ERROR_INVALID_PARAMETER );
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else thread->affinity = req->affinity;
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}
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}
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/* suspend a thread */
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static int suspend_thread( struct thread *thread )
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{
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int old_count = thread->suspend;
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if (thread->suspend < MAXIMUM_SUSPEND_COUNT)
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{
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if (!(thread->process->suspend + thread->suspend++))
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{
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if (thread->unix_pid) kill( thread->unix_pid, SIGSTOP );
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}
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}
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return old_count;
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}
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/* resume a thread */
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static int resume_thread( struct thread *thread )
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{
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int old_count = thread->suspend;
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if (thread->suspend > 0)
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{
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if (!(--thread->suspend + thread->process->suspend))
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{
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if (thread->unix_pid) kill( thread->unix_pid, SIGCONT );
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}
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}
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return old_count;
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}
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/* suspend all threads but the current */
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void suspend_all_threads( void )
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{
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struct thread *thread;
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for ( thread = first_thread; thread; thread = thread->next )
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if ( thread != current )
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suspend_thread( thread );
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}
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/* resume all threads but the current */
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void resume_all_threads( void )
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{
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struct thread *thread;
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for ( thread = first_thread; thread; thread = thread->next )
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if ( thread != current )
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resume_thread( thread );
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}
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/* add a thread to an object wait queue; return 1 if OK, 0 on error */
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int add_queue( struct object *obj, struct wait_queue_entry *entry )
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{
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grab_object( obj );
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entry->obj = obj;
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entry->prev = obj->tail;
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entry->next = NULL;
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if (obj->tail) obj->tail->next = entry;
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else obj->head = entry;
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obj->tail = entry;
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return 1;
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}
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/* remove a thread from an object wait queue */
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void remove_queue( struct object *obj, struct wait_queue_entry *entry )
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{
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if (entry->next) entry->next->prev = entry->prev;
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else obj->tail = entry->prev;
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if (entry->prev) entry->prev->next = entry->next;
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else obj->head = entry->next;
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release_object( obj );
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}
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/* finish waiting */
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static void end_wait( struct thread *thread )
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{
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struct thread_wait *wait = thread->wait;
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struct wait_queue_entry *entry;
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int i;
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assert( wait );
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for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
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entry->obj->ops->remove_queue( entry->obj, entry );
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if (wait->user) remove_timeout_user( wait->user );
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free( wait );
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thread->wait = NULL;
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}
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/* build the thread wait structure */
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static int wait_on( struct thread *thread, int count,
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int *handles, int flags, int timeout )
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{
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struct thread_wait *wait;
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struct wait_queue_entry *entry;
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struct object *obj;
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int i;
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if ((count < 0) || (count > MAXIMUM_WAIT_OBJECTS))
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{
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set_error( ERROR_INVALID_PARAMETER );
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return 0;
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}
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if (!(wait = mem_alloc( sizeof(*wait) + (count-1) * sizeof(*entry) ))) return 0;
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thread->wait = wait;
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wait->count = count;
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wait->flags = flags;
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wait->user = NULL;
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if (flags & SELECT_TIMEOUT) make_timeout( &wait->timeout, timeout );
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for (i = 0, entry = wait->queues; i < count; i++, entry++)
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{
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if (!(obj = get_handle_obj( thread->process, handles[i],
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SYNCHRONIZE, NULL )))
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{
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wait->count = i - 1;
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end_wait( thread );
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return 0;
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}
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entry->thread = thread;
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if (!obj->ops->add_queue( obj, entry ))
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{
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wait->count = i - 1;
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end_wait( thread );
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return 0;
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}
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release_object( obj );
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}
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return 1;
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}
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/* check if the thread waiting condition is satisfied */
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static int check_wait( struct thread *thread, int *signaled )
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{
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int i;
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struct thread_wait *wait = thread->wait;
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struct wait_queue_entry *entry = wait->queues;
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assert( wait );
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if (wait->flags & SELECT_ALL)
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{
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int not_ok = 0;
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/* Note: we must check them all anyway, as some objects may
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* want to do something when signaled, even if others are not */
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for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
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not_ok |= !entry->obj->ops->signaled( entry->obj, thread );
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if (not_ok) goto other_checks;
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/* Wait satisfied: tell it to all objects */
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*signaled = 0;
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for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
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if (entry->obj->ops->satisfied( entry->obj, thread ))
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*signaled = STATUS_ABANDONED_WAIT_0;
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return 1;
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}
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else
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{
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for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
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{
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if (!entry->obj->ops->signaled( entry->obj, thread )) continue;
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/* Wait satisfied: tell it to the object */
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*signaled = i;
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if (entry->obj->ops->satisfied( entry->obj, thread ))
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*signaled = i + STATUS_ABANDONED_WAIT_0;
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return 1;
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}
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}
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other_checks:
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if ((wait->flags & SELECT_ALERTABLE) && thread->apc)
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{
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*signaled = STATUS_USER_APC;
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return 1;
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}
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if (wait->flags & SELECT_TIMEOUT)
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{
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struct timeval now;
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gettimeofday( &now, NULL );
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if ((now.tv_sec > wait->timeout.tv_sec) ||
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((now.tv_sec == wait->timeout.tv_sec) &&
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(now.tv_usec >= wait->timeout.tv_usec)))
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{
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*signaled = STATUS_TIMEOUT;
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return 1;
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}
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}
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return 0;
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}
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/* attempt to wake up a thread */
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/* return 1 if OK, 0 if the wait condition is still not satisfied */
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static int wake_thread( struct thread *thread )
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{
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struct select_request *req = get_req_ptr( thread );
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if (!check_wait( thread, &req->signaled )) return 0;
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end_wait( thread );
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return 1;
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}
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/* sleep on a list of objects */
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static void sleep_on( struct thread *thread, int count, int *handles, int flags, int timeout )
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{
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struct select_request *req;
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assert( !thread->wait );
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if (!wait_on( thread, count, handles, flags, timeout )) goto error;
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if (wake_thread( thread )) return;
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/* now we need to wait */
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if (flags & SELECT_TIMEOUT)
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{
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if (!(thread->wait->user = add_timeout_user( &thread->wait->timeout,
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call_timeout_handler, thread )))
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goto error;
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}
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thread->state = SLEEPING;
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return;
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error:
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req = get_req_ptr( thread );
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req->signaled = -1;
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}
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/* timeout for the current thread */
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void thread_timeout(void)
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{
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struct select_request *req = get_req_ptr( current );
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assert( current->wait );
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current->wait->user = NULL;
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end_wait( current );
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req->signaled = STATUS_TIMEOUT;
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send_reply( current );
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}
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/* attempt to wake threads sleeping on the object wait queue */
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void wake_up( struct object *obj, int max )
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{
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struct wait_queue_entry *entry = obj->head;
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while (entry)
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{
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struct thread *thread = entry->thread;
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entry = entry->next;
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if (wake_thread( thread ))
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{
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send_reply( thread );
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if (max && !--max) break;
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}
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}
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}
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/* queue an async procedure call */
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static int thread_queue_apc( struct thread *thread, void *func, void *param )
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{
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struct thread_apc *apc;
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if (!thread->apc)
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{
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if (!(thread->apc = mem_alloc( MAX_THREAD_APC * sizeof(*apc) )))
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return 0;
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thread->apc_count = 0;
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}
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else if (thread->apc_count >= MAX_THREAD_APC) return 0;
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thread->apc[thread->apc_count].func = func;
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thread->apc[thread->apc_count].param = param;
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thread->apc_count++;
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if (thread->wait)
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{
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if (wake_thread( thread )) send_reply( thread );
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}
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return 1;
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}
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/* kill a thread on the spot */
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void kill_thread( struct thread *thread, int exit_code )
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{
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if (thread->state == TERMINATED) return; /* already killed */
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if (thread->unix_pid) kill( thread->unix_pid, SIGTERM );
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remove_client( thread->client, exit_code ); /* this will call thread_killed */
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}
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/* a thread has been killed */
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void thread_killed( struct thread *thread, int exit_code )
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{
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thread->state = TERMINATED;
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thread->exit_code = exit_code;
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if (thread->wait) end_wait( thread );
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debug_exit_thread( thread, exit_code );
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abandon_mutexes( thread );
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remove_process_thread( thread->process, thread );
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wake_up( &thread->obj, 0 );
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release_object( thread );
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}
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/* create a new thread */
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DECL_HANDLER(new_thread)
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{
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struct thread *thread;
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struct process *process;
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if ((process = get_process_from_id( req->pid )))
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{
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if ((fd = dup(fd)) != -1)
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{
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if ((thread = create_thread( fd, process, req->suspend )))
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{
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req->tid = thread;
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if ((req->handle = alloc_handle( current->process, thread,
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THREAD_ALL_ACCESS, req->inherit )) == -1)
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release_object( thread );
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/* else will be released when the thread gets killed */
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}
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else close( fd );
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}
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else file_set_error();
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release_object( process );
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}
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}
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/* retrieve the thread buffer file descriptor */
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DECL_HANDLER(get_thread_buffer)
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{
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fatal_protocol_error( current, "get_thread_buffer: should never get called directly\n" );
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}
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/* initialize a new thread */
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DECL_HANDLER(init_thread)
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{
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if (current->state != STARTING)
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{
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fatal_protocol_error( current, "init_thread: already running\n" );
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|
return;
|
|
}
|
|
current->state = RUNNING;
|
|
current->unix_pid = req->unix_pid;
|
|
current->teb = req->teb;
|
|
if (current->suspend + current->process->suspend > 0)
|
|
kill( current->unix_pid, SIGSTOP );
|
|
req->pid = current->process;
|
|
req->tid = current;
|
|
}
|
|
|
|
/* terminate a thread */
|
|
DECL_HANDLER(terminate_thread)
|
|
{
|
|
struct thread *thread;
|
|
|
|
if ((thread = get_thread_from_handle( req->handle, THREAD_TERMINATE )))
|
|
{
|
|
kill_thread( thread, req->exit_code );
|
|
release_object( thread );
|
|
}
|
|
}
|
|
|
|
/* fetch information about a thread */
|
|
DECL_HANDLER(get_thread_info)
|
|
{
|
|
struct thread *thread;
|
|
|
|
if ((thread = get_thread_from_handle( req->handle, THREAD_QUERY_INFORMATION )))
|
|
{
|
|
req->tid = thread;
|
|
req->exit_code = thread->exit_code;
|
|
req->priority = thread->priority;
|
|
release_object( thread );
|
|
}
|
|
}
|
|
|
|
/* set information about a thread */
|
|
DECL_HANDLER(set_thread_info)
|
|
{
|
|
struct thread *thread;
|
|
|
|
if ((thread = get_thread_from_handle( req->handle, THREAD_SET_INFORMATION )))
|
|
{
|
|
set_thread_info( thread, req );
|
|
release_object( thread );
|
|
}
|
|
}
|
|
|
|
/* suspend a thread */
|
|
DECL_HANDLER(suspend_thread)
|
|
{
|
|
struct thread *thread;
|
|
|
|
if ((thread = get_thread_from_handle( req->handle, THREAD_SUSPEND_RESUME )))
|
|
{
|
|
req->count = suspend_thread( thread );
|
|
release_object( thread );
|
|
}
|
|
}
|
|
|
|
/* resume a thread */
|
|
DECL_HANDLER(resume_thread)
|
|
{
|
|
struct thread *thread;
|
|
|
|
if ((thread = get_thread_from_handle( req->handle, THREAD_SUSPEND_RESUME )))
|
|
{
|
|
req->count = resume_thread( thread );
|
|
release_object( thread );
|
|
}
|
|
}
|
|
|
|
/* select on a handle list */
|
|
DECL_HANDLER(select)
|
|
{
|
|
sleep_on( current, req->count, req->handles, req->flags, req->timeout );
|
|
}
|
|
|
|
/* queue an APC for a thread */
|
|
DECL_HANDLER(queue_apc)
|
|
{
|
|
struct thread *thread;
|
|
if ((thread = get_thread_from_handle( req->handle, THREAD_SET_CONTEXT )))
|
|
{
|
|
thread_queue_apc( thread, req->func, req->param );
|
|
release_object( thread );
|
|
}
|
|
}
|
|
|
|
/* get list of APC to call */
|
|
DECL_HANDLER(get_apcs)
|
|
{
|
|
if ((req->count = current->apc_count))
|
|
{
|
|
memcpy( req->apcs, current->apc, current->apc_count * sizeof(*current->apc) );
|
|
free( current->apc );
|
|
current->apc = NULL;
|
|
current->apc_count = 0;
|
|
}
|
|
}
|