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Merge tag 'block-pull-request' into staging

# gpg: Signature made Fri 12 May 2017 10:37:12 AM EDT
# gpg:                using RSA key 0x9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>"
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>"
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* tag 'block-pull-request':
  aio: add missing aio_notify() to aio_enable_external()
  block: Simplify BDRV_BLOCK_RAW recursion
  coroutine: remove GThread implementation

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2017-05-12 10:39:19 -04:00
commit b54933eed5
5 changed files with 16 additions and 220 deletions
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5
.travis.yml
View file

@ -86,9 +86,6 @@ matrix:
- env: CONFIG="--enable-trace-backends=ust"
TEST_CMD=""
compiler: gcc
- env: CONFIG="--with-coroutine=gthread"
TEST_CMD=""
compiler: gcc
- env: CONFIG=""
os: osx
compiler: clang
@ -191,7 +188,7 @@ matrix:
compiler: none
env:
- COMPILER_NAME=gcc CXX=g++-5 CC=gcc-5
- CONFIG="--cc=gcc-5 --cxx=g++-5 --disable-pie --disable-linux-user --with-coroutine=gthread"
- CONFIG="--cc=gcc-5 --cxx=g++-5 --disable-pie --disable-linux-user"
- TEST_CMD=""
before_script:
- ./configure ${CONFIG} --extra-cflags="-g3 -O0 -fsanitize=thread -fuse-ld=gold" || cat config.log

4
block/io.c
View file

@ -1784,8 +1784,8 @@ static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs,
if (ret & BDRV_BLOCK_RAW) {
assert(ret & BDRV_BLOCK_OFFSET_VALID);
ret = bdrv_get_block_status(*file, ret >> BDRV_SECTOR_BITS,
*pnum, pnum, file);
ret = bdrv_co_get_block_status(*file, ret >> BDRV_SECTOR_BITS,
*pnum, pnum, file);
goto out;
}

19
configure vendored
View file

@ -1334,7 +1334,7 @@ Advanced options (experts only):
--oss-lib path to OSS library
--cpu=CPU Build for host CPU [$cpu]
--with-coroutine=BACKEND coroutine backend. Supported options:
gthread, ucontext, sigaltstack, windows
ucontext, sigaltstack, windows
--enable-gcov enable test coverage analysis with gcov
--gcov=GCOV use specified gcov [$gcov_tool]
--disable-blobs disable installing provided firmware blobs
@ -4418,10 +4418,8 @@ fi
# check and set a backend for coroutine
# We prefer ucontext, but it's not always possible. The fallback
# is sigcontext. gthread is not selectable except explicitly, because
# it is not functional enough to run QEMU proper. (It is occasionally
# useful for debugging purposes.) On Windows the only valid backend
# is the Windows-specific one.
# is sigcontext. On Windows the only valid backend is the Windows
# specific one.
ucontext_works=no
if test "$darwin" != "yes"; then
@ -4460,7 +4458,7 @@ else
feature_not_found "ucontext"
fi
;;
gthread|sigaltstack)
sigaltstack)
if test "$mingw32" = "yes"; then
error_exit "only the 'windows' coroutine backend is valid for Windows"
fi
@ -4472,14 +4470,7 @@ else
fi
if test "$coroutine_pool" = ""; then
if test "$coroutine" = "gthread"; then
coroutine_pool=no
else
coroutine_pool=yes
fi
fi
if test "$coroutine" = "gthread" -a "$coroutine_pool" = "yes"; then
error_exit "'gthread' coroutine backend does not support pool (use --disable-coroutine-pool)"
coroutine_pool=yes
fi
if test "$debug_stack_usage" = "yes"; then

10
include/block/aio.h
View file

@ -454,8 +454,14 @@ static inline void aio_disable_external(AioContext *ctx)
*/
static inline void aio_enable_external(AioContext *ctx)
{
assert(ctx->external_disable_cnt > 0);
atomic_dec(&ctx->external_disable_cnt);
int old;
old = atomic_fetch_dec(&ctx->external_disable_cnt);
assert(old > 0);
if (old == 1) {
/* Kick event loop so it re-arms file descriptors */
aio_notify(ctx);
}
}
/**

198
util/coroutine-gthread.c
View file

@ -1,198 +0,0 @@
/*
* GThread coroutine initialization code
*
* Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>
* Copyright (C) 2011 Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.0 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qemu/coroutine_int.h"
typedef struct {
Coroutine base;
GThread *thread;
bool runnable;
bool free_on_thread_exit;
CoroutineAction action;
} CoroutineGThread;
static CompatGMutex coroutine_lock;
static CompatGCond coroutine_cond;
/* GLib 2.31 and beyond deprecated various parts of the thread API,
* but the new interfaces are not available in older GLib versions
* so we have to cope with both.
*/
#if GLIB_CHECK_VERSION(2, 31, 0)
/* Awkwardly, the GPrivate API doesn't provide a way to update the
* GDestroyNotify handler for the coroutine key dynamically. So instead
* we track whether or not the CoroutineGThread should be freed on
* thread exit / coroutine key update using the free_on_thread_exit
* field.
*/
static void coroutine_destroy_notify(gpointer data)
{
CoroutineGThread *co = data;
if (co && co->free_on_thread_exit) {
g_free(co);
}
}
static GPrivate coroutine_key = G_PRIVATE_INIT(coroutine_destroy_notify);
static inline CoroutineGThread *get_coroutine_key(void)
{
return g_private_get(&coroutine_key);
}
static inline void set_coroutine_key(CoroutineGThread *co,
bool free_on_thread_exit)
{
/* Unlike g_static_private_set() this does not call the GDestroyNotify
* if the previous value of the key was NULL. Fortunately we only need
* the GDestroyNotify in the non-NULL key case.
*/
co->free_on_thread_exit = free_on_thread_exit;
g_private_replace(&coroutine_key, co);
}
static inline GThread *create_thread(GThreadFunc func, gpointer data)
{
return g_thread_new("coroutine", func, data);
}
#else
/* Handle older GLib versions */
static GStaticPrivate coroutine_key = G_STATIC_PRIVATE_INIT;
static inline CoroutineGThread *get_coroutine_key(void)
{
return g_static_private_get(&coroutine_key);
}
static inline void set_coroutine_key(CoroutineGThread *co,
bool free_on_thread_exit)
{
g_static_private_set(&coroutine_key, co,
free_on_thread_exit ? (GDestroyNotify)g_free : NULL);
}
static inline GThread *create_thread(GThreadFunc func, gpointer data)
{
return g_thread_create_full(func, data, 0, TRUE, TRUE,
G_THREAD_PRIORITY_NORMAL, NULL);
}
#endif
static void __attribute__((constructor)) coroutine_init(void)
{
#if !GLIB_CHECK_VERSION(2, 31, 0)
if (!g_thread_supported()) {
g_thread_init(NULL);
}
#endif
}
static void coroutine_wait_runnable_locked(CoroutineGThread *co)
{
while (!co->runnable) {
g_cond_wait(&coroutine_cond, &coroutine_lock);
}
}
static void coroutine_wait_runnable(CoroutineGThread *co)
{
g_mutex_lock(&coroutine_lock);
coroutine_wait_runnable_locked(co);
g_mutex_unlock(&coroutine_lock);
}
static gpointer coroutine_thread(gpointer opaque)
{
CoroutineGThread *co = opaque;
set_coroutine_key(co, false);
coroutine_wait_runnable(co);
co->base.entry(co->base.entry_arg);
qemu_coroutine_switch(&co->base, co->base.caller, COROUTINE_TERMINATE);
return NULL;
}
Coroutine *qemu_coroutine_new(void)
{
CoroutineGThread *co;
co = g_malloc0(sizeof(*co));
co->thread = create_thread(coroutine_thread, co);
if (!co->thread) {
g_free(co);
return NULL;
}
return &co->base;
}
void qemu_coroutine_delete(Coroutine *co_)
{
CoroutineGThread *co = DO_UPCAST(CoroutineGThread, base, co_);
g_thread_join(co->thread);
g_free(co);
}
CoroutineAction qemu_coroutine_switch(Coroutine *from_,
Coroutine *to_,
CoroutineAction action)
{
CoroutineGThread *from = DO_UPCAST(CoroutineGThread, base, from_);
CoroutineGThread *to = DO_UPCAST(CoroutineGThread, base, to_);
g_mutex_lock(&coroutine_lock);
from->runnable = false;
from->action = action;
to->runnable = true;
to->action = action;
g_cond_broadcast(&coroutine_cond);
if (action != COROUTINE_TERMINATE) {
coroutine_wait_runnable_locked(from);
}
g_mutex_unlock(&coroutine_lock);
return from->action;
}
Coroutine *qemu_coroutine_self(void)
{
CoroutineGThread *co = get_coroutine_key();
if (!co) {
co = g_malloc0(sizeof(*co));
co->runnable = true;
set_coroutine_key(co, true);
}
return &co->base;
}
bool qemu_in_coroutine(void)
{
CoroutineGThread *co = get_coroutine_key();
return co && co->base.caller;
}