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qemu/main-loop: Introduce QEMU_IOTHREAD_LOCK_GUARD

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Create a wrapper for locking/unlocking the iothread lock.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2022-11-17 18:51:43 -08:00
parent a813e36f2b
commit 0aa5d47ac5
1 changed files with 29 additions and 0 deletions
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29
include/qemu/main-loop.h
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@ -343,6 +343,35 @@ void qemu_mutex_lock_iothread_impl(const char *file, int line);
*/
void qemu_mutex_unlock_iothread(void);
/**
* QEMU_IOTHREAD_LOCK_GUARD
*
* Wrap a block of code in a conditional qemu_mutex_{lock,unlock}_iothread.
*/
typedef struct IOThreadLockAuto IOThreadLockAuto;
static inline IOThreadLockAuto *qemu_iothread_auto_lock(const char *file,
int line)
{
if (qemu_mutex_iothread_locked()) {
return NULL;
}
qemu_mutex_lock_iothread_impl(file, line);
/* Anything non-NULL causes the cleanup function to be called */
return (IOThreadLockAuto *)(uintptr_t)1;
}
static inline void qemu_iothread_auto_unlock(IOThreadLockAuto *l)
{
qemu_mutex_unlock_iothread();
}
G_DEFINE_AUTOPTR_CLEANUP_FUNC(IOThreadLockAuto, qemu_iothread_auto_unlock)
#define QEMU_IOTHREAD_LOCK_GUARD() \
g_autoptr(IOThreadLockAuto) _iothread_lock_auto __attribute__((unused)) \
= qemu_iothread_auto_lock(__FILE__, __LINE__)
/*
* qemu_cond_wait_iothread: Wait on condition for the main loop mutex
*