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| author | Ulrich Drepper <drepper@redhat.com> | 2001-08-30 02:13:26 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2001-08-30 02:13:26 +0000 |
| commit | 746802f20fae7bd377ce5d7aa9114357af48e178 (patch) | |
| tree | f8e4c7456aedf677054c4491264435137daa0d64 /linuxthreads/spinlock.c | |
| parent | 6c3ebebd1eddb7041248125fa5e228380400c436 (diff) | |
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Update.
2001-08-29 Ulrich Drepper <drepper@redhat.com>
* spinlock.c (__pthread_lock): Top max_count value with
MAX_ADAPTIVE_SPIN_COUNT.
* internals.h (MAX_ADAPTIVE_SPIN_COUNT): Define if not already done.
* sysdeps/i386/i686/pt-machine.h (BUSY_WAIT_NOP): New macro to
help P4.
Diffstat (limited to 'linuxthreads/spinlock.c')
| -rw-r--r-- | linuxthreads/spinlock.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/linuxthreads/spinlock.c b/linuxthreads/spinlock.c index 199386a4fc..3e16825997 100644 --- a/linuxthreads/spinlock.c +++ b/linuxthreads/spinlock.c @@ -94,6 +94,9 @@ again: if (__pthread_smp_kernel) { int max_count = lock->__spinlock * 2 + 10; + if (max_count > MAX_ADAPTIVE_SPIN_COUNT) + max_count = MAX_ADAPTIVE_SPIN_COUNT; + for (spin_count = 0; spin_count < max_count; spin_count++) { if (((oldstatus = lock->__status) & 1) == 0) { if(__compare_and_swap(&lock->__status, oldstatus, oldstatus | 1)) @@ -104,6 +107,9 @@ again: return; } } +#ifdef BUSY_WAIT_NOP + BUSY_WAIT_NOP; +#endif __asm __volatile ("" : "=m" (lock->__status) : "0" (lock->__status)); } |