qemu/main-loop: Introduce QEMU_IOTHREAD_LOCK_GUARD
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>
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@ -343,6 +343,35 @@ void qemu_mutex_lock_iothread_impl(const char *file, int line);
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*/
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*/
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void qemu_mutex_unlock_iothread(void);
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void qemu_mutex_unlock_iothread(void);
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/**
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* QEMU_IOTHREAD_LOCK_GUARD
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*
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* Wrap a block of code in a conditional qemu_mutex_{lock,unlock}_iothread.
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*/
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typedef struct IOThreadLockAuto IOThreadLockAuto;
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static inline IOThreadLockAuto *qemu_iothread_auto_lock(const char *file,
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int line)
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{
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if (qemu_mutex_iothread_locked()) {
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return NULL;
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}
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qemu_mutex_lock_iothread_impl(file, line);
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/* Anything non-NULL causes the cleanup function to be called */
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return (IOThreadLockAuto *)(uintptr_t)1;
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}
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static inline void qemu_iothread_auto_unlock(IOThreadLockAuto *l)
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{
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qemu_mutex_unlock_iothread();
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}
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G_DEFINE_AUTOPTR_CLEANUP_FUNC(IOThreadLockAuto, qemu_iothread_auto_unlock)
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#define QEMU_IOTHREAD_LOCK_GUARD() \
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g_autoptr(IOThreadLockAuto) _iothread_lock_auto __attribute__((unused)) \
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= qemu_iothread_auto_lock(__FILE__, __LINE__)
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/*
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/*
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* qemu_cond_wait_iothread: Wait on condition for the main loop mutex
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* qemu_cond_wait_iothread: Wait on condition for the main loop mutex
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*
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*
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