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qemu-thread: Document QemuEvent

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Document QemuEvent to help choose an appropriate synchronization
primitive.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Link: https://lore.kernel.org/r/20250529-event-v5-12-53b285203794@daynix.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Akihiko Odaki 2025-05-29 14:46:01 +09:00 • committed by Paolo Bonzini
parent 0a765ca850
commit 5e2312f75a
1 changed files with 10 additions and 0 deletions
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10
include/qemu/thread.h
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@ -10,6 +10,16 @@ typedef struct QemuSemaphore QemuSemaphore;
typedef struct QemuLockCnt QemuLockCnt;
typedef struct QemuThread QemuThread;
/*
* QemuEvent
* =========
*
* QemuEvent is an implementation of Win32 manual-reset event object.
* For details, refer to:
* https://learn.microsoft.com/en-us/windows/win32/sync/using-event-objects
*
* QemuEvent is more lightweight than QemuSemaphore when HAVE_FUTEX is defined.
*/
typedef struct QemuEvent {
#ifndef HAVE_FUTEX
pthread_mutex_t lock;