mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-27 04:52:05 +08:00
dc6c21dabf
This updates gnulib to a relatively recent commit. Most of this was done by the gnulib import script; the only change I made was to update-gnulib.sh. Tested on x86-64 Fedora 34. I also did a mingw cross build.
128 lines
3.3 KiB
C
128 lines
3.3 KiB
C
/* Plain recursive mutexes (native Windows implementation).
|
|
Copyright (C) 2005-2022 Free Software Foundation, Inc.
|
|
|
|
This file 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 2.1 of the
|
|
License, or (at your option) any later version.
|
|
|
|
This file 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 program. If not, see <https://www.gnu.org/licenses/>. */
|
|
|
|
/* Written by Bruno Haible <bruno@clisp.org>, 2005.
|
|
Based on GCC's gthr-win32.h. */
|
|
|
|
#include <config.h>
|
|
|
|
/* Specification. */
|
|
#include "windows-recmutex.h"
|
|
|
|
#include <errno.h>
|
|
|
|
void
|
|
glwthread_recmutex_init (glwthread_recmutex_t *mutex)
|
|
{
|
|
mutex->owner = 0;
|
|
mutex->depth = 0;
|
|
InitializeCriticalSection (&mutex->lock);
|
|
mutex->guard.done = 1;
|
|
}
|
|
|
|
int
|
|
glwthread_recmutex_lock (glwthread_recmutex_t *mutex)
|
|
{
|
|
if (!mutex->guard.done)
|
|
{
|
|
if (InterlockedIncrement (&mutex->guard.started) == 0)
|
|
/* This thread is the first one to need this mutex. Initialize it. */
|
|
glwthread_recmutex_init (mutex);
|
|
else
|
|
{
|
|
/* Don't let mutex->guard.started grow and wrap around. */
|
|
InterlockedDecrement (&mutex->guard.started);
|
|
/* Yield the CPU while waiting for another thread to finish
|
|
initializing this mutex. */
|
|
while (!mutex->guard.done)
|
|
Sleep (0);
|
|
}
|
|
}
|
|
{
|
|
DWORD self = GetCurrentThreadId ();
|
|
if (mutex->owner != self)
|
|
{
|
|
EnterCriticalSection (&mutex->lock);
|
|
mutex->owner = self;
|
|
}
|
|
if (++(mutex->depth) == 0) /* wraparound? */
|
|
{
|
|
mutex->depth--;
|
|
return EAGAIN;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
glwthread_recmutex_trylock (glwthread_recmutex_t *mutex)
|
|
{
|
|
if (!mutex->guard.done)
|
|
{
|
|
if (InterlockedIncrement (&mutex->guard.started) == 0)
|
|
/* This thread is the first one to need this mutex. Initialize it. */
|
|
glwthread_recmutex_init (mutex);
|
|
else
|
|
{
|
|
/* Don't let mutex->guard.started grow and wrap around. */
|
|
InterlockedDecrement (&mutex->guard.started);
|
|
/* Let another thread finish initializing this mutex, and let it also
|
|
lock this mutex. */
|
|
return EBUSY;
|
|
}
|
|
}
|
|
{
|
|
DWORD self = GetCurrentThreadId ();
|
|
if (mutex->owner != self)
|
|
{
|
|
if (!TryEnterCriticalSection (&mutex->lock))
|
|
return EBUSY;
|
|
mutex->owner = self;
|
|
}
|
|
if (++(mutex->depth) == 0) /* wraparound? */
|
|
{
|
|
mutex->depth--;
|
|
return EAGAIN;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
glwthread_recmutex_unlock (glwthread_recmutex_t *mutex)
|
|
{
|
|
if (mutex->owner != GetCurrentThreadId ())
|
|
return EPERM;
|
|
if (mutex->depth == 0)
|
|
return EINVAL;
|
|
if (--(mutex->depth) == 0)
|
|
{
|
|
mutex->owner = 0;
|
|
LeaveCriticalSection (&mutex->lock);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
glwthread_recmutex_destroy (glwthread_recmutex_t *mutex)
|
|
{
|
|
if (mutex->owner != 0)
|
|
return EBUSY;
|
|
DeleteCriticalSection (&mutex->lock);
|
|
mutex->guard.done = 0;
|
|
return 0;
|
|
}
|