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Fixed a couple of races with exiting threads in suspend_for_ptrace().

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This commit is contained in:
Alexandre Julliard 2003-05-06 00:21:21 +00:00
parent ab61506401
commit fcbd0da4a2
1 changed files with 6 additions and 6 deletions
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12
server/ptrace.c
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@ -135,7 +135,7 @@ void sigchld_callback(void)
} }
/* wait for a ptraced child to get a certain signal */ /* wait for a ptraced child to get a certain signal */
static void wait4_thread( struct thread *thread, int signal ) static int wait4_thread( struct thread *thread, int signal )
{ {
int res, status; int res, status;
@ -150,10 +150,11 @@ static void wait4_thread( struct thread *thread, int signal )
thread->attached = 0; thread->attached = 0;
} }
else perror( "wait4" ); else perror( "wait4" );
return; return 0;
} }
res = handle_child_status( thread, res, status, signal ); res = handle_child_status( thread, res, status, signal );
} while (res && res != signal); } while (res && res != signal);
return (thread->unix_pid != -1);
} }
/* return the Unix pid to use in ptrace calls for a given thread */ /* return the Unix pid to use in ptrace calls for a given thread */
@ -199,8 +200,7 @@ static int attach_thread( struct thread *thread )
} }
if (debug_level) fprintf( stderr, "%04x: *attached*\n", thread->id ); if (debug_level) fprintf( stderr, "%04x: *attached*\n", thread->id );
thread->attached = 1; thread->attached = 1;
wait4_thread( thread, SIGSTOP ); return wait4_thread( thread, SIGSTOP );
return 1;
} }
/* detach from a Unix thread and kill it */ /* detach from a Unix thread and kill it */
@ -260,8 +260,8 @@ int suspend_for_ptrace( struct thread *thread )
if (thread->attached) if (thread->attached)
{ {
send_thread_signal( thread, SIGSTOP ); if (!send_thread_signal( thread, SIGSTOP )) goto error;
wait4_thread( thread, SIGSTOP ); if (!wait4_thread( thread, SIGSTOP )) goto error;
return 1; return 1;
} }
if (attach_thread( thread )) return 1; if (attach_thread( thread )) return 1;