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virthread: Introduce VIR_WITH_MUTEX_LOCK_GUARD
Modeled after "WITH_QEMU_LOCK_GUARD" (see qemu's include/qemu/lockable.h). See comment for typical usage. Signed-off-by: Tim Wiederhake <twiederh@redhat.com> Reviewed-by: Martin Kletzander <mkletzan@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
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@ -209,3 +209,24 @@ int virThreadLocalSet(virThreadLocal *l, void*) G_GNUC_WARN_UNUSED_RESULT;
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return 0; \
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} \
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struct classname ## EatSemicolon
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#define VIR_WITH_MUTEX_LOCK_GUARD_(m, name) \
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for (g_auto(virLockGuard) name = virLockGuardLock(m); name.mutex; \
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name.mutex = (virLockGuardUnlock(&name), NULL))
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/**
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* VIR_WITH_MUTEX_LOCK_GUARD:
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*
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* This macro defines a lock scope such that entering the scope takes the lock
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* and leaving the scope releases the lock. Return statements are allowed
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* within the scope and release the lock. Break and continue statements leave
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* the scope early and release the lock.
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*
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* virMutex *mutex = ...;
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*
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* VIR_WITH_MUTEX_LOCK_GUARD(mutex) {
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* // `mutex` is locked, and released automatically on scope exit
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* ...
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* }
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*/
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#define VIR_WITH_MUTEX_LOCK_GUARD(m) \
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VIR_WITH_MUTEX_LOCK_GUARD_(m, CONCAT(var, __COUNTER__))
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