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virthread: Introduce VIR_WITH_MUTEX_LOCK_GUARD

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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>
This commit is contained in:
Tim Wiederhake 2021-08-25 10:25:32 +02:00
parent d00d078968
commit 2075195d70
1 changed files with 21 additions and 0 deletions
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21
src/util/virthread.h
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@ -209,3 +209,24 @@ int virThreadLocalSet(virThreadLocal *l, void*) G_GNUC_WARN_UNUSED_RESULT;
return 0; \
} \
struct classname ## EatSemicolon
#define VIR_WITH_MUTEX_LOCK_GUARD_(m, name) \
for (g_auto(virLockGuard) name = virLockGuardLock(m); name.mutex; \
name.mutex = (virLockGuardUnlock(&name), NULL))
/**
* VIR_WITH_MUTEX_LOCK_GUARD:
*
* This macro defines a lock scope such that entering the scope takes the lock
* and leaving the scope releases the lock. Return statements are allowed
* within the scope and release the lock. Break and continue statements leave
* the scope early and release the lock.
*
* virMutex *mutex = ...;
*
* VIR_WITH_MUTEX_LOCK_GUARD(mutex) {
* // `mutex` is locked, and released automatically on scope exit
* ...
* }
*/
#define VIR_WITH_MUTEX_LOCK_GUARD(m) \
VIR_WITH_MUTEX_LOCK_GUARD_(m, CONCAT(var, __COUNTER__))