Mercurial > hg > nginx-vendor-0-8
diff src/core/ngx_shmtx.h @ 160:73e8476f9142 NGINX_0_3_27
nginx 0.3.27
*) 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 <http://sysoev.ru> |
---|---|
date | Wed, 08 Feb 2006 00:00:00 +0300 |
parents | |
children | 6ae1357b7b7c |
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new file mode 100644 --- /dev/null +++ b/src/core/ngx_shmtx.h @@ -0,0 +1,111 @@ + +/* + * Copyright (C) Igor Sysoev + */ + + +#ifndef _NGX_SHMTX_H_INCLUDED_ +#define _NGX_SHMTX_H_INCLUDED_ + + +#include <ngx_config.h> +#include <ngx_core.h> + + +typedef struct { +#if (NGX_HAVE_ATOMIC_OPS) + ngx_atomic_t *lock; +#else + ngx_fd_t fd; + u_char *name; + ngx_log_t *log; +#endif +} ngx_shmtx_t; + + +ngx_int_t ngx_shmtx_create(ngx_shmtx_t *mtx, void *addr, u_char *name, + ngx_log_t *log); + + +#if (NGX_HAVE_ATOMIC_OPS) + +static ngx_inline ngx_uint_t +ngx_shmtx_trylock(ngx_shmtx_t *mtx) +{ + if (*mtx->lock == 0 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid)) { + return 1; + } + + return 0; +} + +#define ngx_shmtx_lock(mtx) ngx_spinlock((mtx)->lock, ngx_pid, 1024) + +#define ngx_shmtx_unlock(mtx) (void) ngx_atomic_cmp_set((mtx)->lock, ngx_pid, 0) + +#define ngx_shmtx_destory(mtx) + + +#else + +static ngx_inline ngx_uint_t +ngx_shmtx_trylock(ngx_shmtx_t *mtx) +{ + ngx_err_t err; + + err = ngx_trylock_fd(mtx->fd); + + if (err == 0) { + return 1; + } + + if (err == NGX_EAGAIN) { + return 0; + } + + ngx_log_error(NGX_LOG_ALERT, mtx->log, err, ngx_trylock_fd_n " failed"); + + ngx_abort(); +} + + +static ngx_inline void +ngx_shmtx_lock(ngx_shmtx_t *mtx) +{ + ngx_err_t err; + + err = ngx_lock_fd(mtx->fd); + + if (err == 0) { + return; + } + + ngx_log_error(NGX_LOG_ALERT, mtx->log, err, ngx_lock_fd_n " failed"); + + ngx_abort(); +} + + +static ngx_inline void +ngx_shmtx_unlock(ngx_shmtx_t *mtx) +{ + ngx_err_t err; + + err = ngx_unlock_fd(mtx->fd); + + if (err == 0) { + return; + } + + ngx_log_error(NGX_LOG_ALERT, mtx->log, err, ngx_unlock_fd_n " failed"); + + ngx_abort(); +} + + +void ngx_shmtx_destory(ngx_shmtx_t *mtx); + +#endif + + +#endif /* _NGX_SHMTX_H_INCLUDED_ */