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| author | jasone <jasone@FreeBSD.org> | 2008-08-14 17:31:42 +0000 |
|---|---|---|
| committer | jasone <jasone@FreeBSD.org> | 2008-08-14 17:31:42 +0000 |
| commit | 463ec8e02d0db95b50ab7a1c71563cb72e824d7c (patch) | |
| tree | 214c36c63e89850b7eb4aad445bc0bdc0fbe7004 /lib/libc/stdlib | |
| parent | db987f53e41294a5c44b182ea755e18f2a5ab7ff (diff) | |
| download | FreeBSD-src-463ec8e02d0db95b50ab7a1c71563cb72e824d7c.zip FreeBSD-src-463ec8e02d0db95b50ab7a1c71563cb72e824d7c.tar.gz | |
Move CPU_SPINWAIT into the innermost spin loop, in order to allow faster
preemption while busy-waiting.
Submitted by: Mike Schuster <schuster@adobe.com>
Diffstat (limited to 'lib/libc/stdlib')
| -rw-r--r-- | lib/libc/stdlib/malloc.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/libc/stdlib/malloc.c b/lib/libc/stdlib/malloc.c index 9d0d3b3..b36dbc7 100644 --- a/lib/libc/stdlib/malloc.c +++ b/lib/libc/stdlib/malloc.c @@ -1012,10 +1012,11 @@ malloc_spin_lock(pthread_mutex_t *lock) /* Exponentially back off. */ for (i = 1; i <= SPIN_LIMIT_2POW; i++) { - for (j = 0; j < (1U << i); j++) + for (j = 0; j < (1U << i); j++) { ret++; + CPU_SPINWAIT; + } - CPU_SPINWAIT; if (_pthread_mutex_trylock(lock) == 0) return (ret); } |
