Mercurial > hg > nginx-quic
diff src/core/ngx_spinlock.c @ 611:3f8a2132b93d release-0.3.27
nginx-0.3.27-RELEASE import
*) Change: the "variables_hash_max_size" and
"variables_hash_bucket_size" directives.
*) Feature: the $body_bytes_sent variable can be used not only in the
"log_format" directive.
*) Feature: the $ssl_protocol and $ssl_cipher variables.
*) Feature: the cache line size detection for widespread CPUs at start
time.
*) Feature: now the "accept_mutex" directive is supported using
fcntl(2) on platforms different from i386, amd64, sparc64, and ppc.
*) Feature: the "lock_file" directive and the --with-lock-path=PATH
autoconfiguration directive.
*) Bugfix: if the HTTPS protocol was used in the "proxy_pass" directive
then the requests with the body was not transferred.
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Wed, 08 Feb 2006 15:33:12 +0000 |
parents | 9c2f3ed7a247 |
children | d620f497c50f |
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--- a/src/core/ngx_spinlock.c +++ b/src/core/ngx_spinlock.c @@ -8,36 +8,35 @@ #include <ngx_core.h> -/* - * TODO: the P4 optimized assembler version with the "pause" operation - */ - void -ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin) +ngx_spinlock(ngx_atomic_t *lock, ngx_atomic_int_t value, ngx_uint_t spin) { #if (NGX_HAVE_ATOMIC_OPS) - ngx_uint_t tries; - - tries = 0; + ngx_uint_t i, n; for ( ;; ) { - if (*lock) { - if (ngx_ncpu > 1 && tries++ < spin) { - continue; - } + if (*lock == 0 && ngx_atomic_cmp_set(lock, 0, value)) { + return; + } + + if (ngx_ncpu > 1) { + + for (n = 1; n < spin; n <<= 1) { - ngx_sched_yield(); - - tries = 0; + for (i = 0; i < n; i++) { + ngx_cpu_pause(); + } - } else { - if (ngx_atomic_cmp_set(lock, 0, 1)) { - return; + if (*lock == 0 && ngx_atomic_cmp_set(lock, 0, value)) { + return; + } } } + + ngx_sched_yield(); } #else