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| author | Akihiko Odaki <akihiko.odaki@daynix.com> | 2025-05-29 14:45:55 +0900 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2025-06-06 14:32:55 +0200 |
| commit | 0a765ca850125e0202c366cb4aab032ac9670870 (patch) | |
| tree | 25578e9dd939bbc75993e25cbb40b4acc0cfc683 | |
| parent | 69e10db83ea69cae74b59d27d87cfc61d9dd2b51 (diff) | |
| download | qemu-0a765ca850125e0202c366cb4aab032ac9670870.zip qemu-0a765ca850125e0202c366cb4aab032ac9670870.tar.gz qemu-0a765ca850125e0202c366cb4aab032ac9670870.tar.bz2 | |
qemu-thread: Use futex if available for QemuLockCnt
This unlocks the futex-based implementation of QemuLockCnt to Windows.
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Link: https://lore.kernel.org/r/20250529-event-v5-6-53b285203794@daynix.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | include/qemu/lockcnt.h | 2 | ||||
| -rw-r--r-- | util/lockcnt.c | 7 |
2 files changed, 5 insertions, 4 deletions
diff --git a/include/qemu/lockcnt.h b/include/qemu/lockcnt.h index f4b62a3..5a2800e 100644 --- a/include/qemu/lockcnt.h +++ b/include/qemu/lockcnt.h @@ -17,7 +17,7 @@ typedef struct QemuLockCnt QemuLockCnt; struct QemuLockCnt { -#ifndef CONFIG_LINUX +#ifndef HAVE_FUTEX QemuMutex mutex; #endif unsigned count; diff --git a/util/lockcnt.c b/util/lockcnt.c index ca27d8e..92c9f8c 100644 --- a/util/lockcnt.c +++ b/util/lockcnt.c @@ -12,10 +12,11 @@ #include "qemu/atomic.h" #include "trace.h" -#ifdef CONFIG_LINUX -#include "qemu/futex.h" +#ifdef HAVE_FUTEX -/* On Linux, bits 0-1 are a futex-based lock, bits 2-31 are the counter. +/* + * When futex is available, bits 0-1 are a futex-based lock, bits 2-31 are the + * counter. * For the mutex algorithm see Ulrich Drepper's "Futexes Are Tricky" (ok, * this is not the most relaxing citation I could make...). It is similar * to mutex2 in the paper. |