diff options
| author | Yuji Mano <yuji.mano@am.sony.com> | 2009-06-15 17:03:50 -0700 |
|---|---|---|
| committer | Yuji Mano <yuji.mano@am.sony.com> | 2009-07-07 12:24:23 -0700 |
| commit | fab8eb53d9f74410946f8a08c342e65cc9d51641 (patch) | |
| tree | 4a85bacdd19dc072aea2df8261321ec578049395 | |
| parent | 0ad710a69acf37916364bc57d7b47e65380c74df (diff) | |
| download | mars-src-fab8eb53d9f74410946f8a08c342e65cc9d51641.tar.gz | |
base: host side mutex contention
This reduces the chances of mutex lock contention on the host-side which becomes
apparent when a large number of pthreads are created and access the mutex
simultaneously.
Signed-off-by: Yuji Mano <yuji.mano@am.sony.com>
Acked-by: Kazunori Asayama <asayama@sm.sony.co.jp>
| -rw-r--r-- | base/src/host/lib/mutex_cell.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/base/src/host/lib/mutex_cell.c b/base/src/host/lib/mutex_cell.c index 740b897..f1d0eea 100644 --- a/base/src/host/lib/mutex_cell.c +++ b/base/src/host/lib/mutex_cell.c @@ -108,16 +108,17 @@ int mars_mutex_lock(uint64_t mutex_ea) uint8_t id; int retry; - if (!mutex_ea) { + if (!mutex_ea) return MARS_ERROR_NULL; - } do { header.bits = __lwarx(&mutex->status); /* get my id */ id = header.status.next_id++; - } while (!__stwcx(&mutex->status, header.bits)); + if ((retry = !__stwcx(&mutex->status, header.bits))) + sched_yield(); + } while (retry); do { header.bits = __lwarx(&mutex->status); @@ -125,7 +126,7 @@ int mars_mutex_lock(uint64_t mutex_ea) if (header.status.lock == MARS_MUTEX_LOCKED || header.status.current_id != id) { /* wait until mutex is released */ - usleep(1); + sched_yield(); retry = 1; } else { |