nginx 1.3.2 *) Change: the "single" parameter of the "keepalive" directive is now ignored. *) Change: SSL compression is now disabled when using all versions of OpenSSL, including ones prior to 1.0.0. *) Feature: it is now possible to use the "ip_hash" directive to balance IPv6 clients. *) Feature: the $status variable can now be used not only in the "log_format" directive. *) Bugfix: a segmentation fault might occur in a worker process on shutdown if the "resolver" directive was used. *) Bugfix: a segmentation fault might occur in a worker process if the ngx_http_mp4_module was used. *) Bugfix: in the ngx_http_mp4_module. *) Bugfix: a segmentation fault might occur in a worker process if conflicting wildcard server names were used. *) Bugfix: nginx might be terminated abnormally on a SIGBUS signal on ARM platform. *) Bugfix: an alert "sendmsg() failed (9: Bad file number)" on HP-UX while reconfiguration.

/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_SHMTX_H_INCLUDED_
#define _NGX_SHMTX_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>


typedef struct {
    ngx_atomic_t   lock;
#if (NGX_HAVE_POSIX_SEM)
    ngx_atomic_t   wait;
#endif
} ngx_shmtx_sh_t;


typedef struct {
#if (NGX_HAVE_ATOMIC_OPS)
    ngx_atomic_t  *lock;
#if (NGX_HAVE_POSIX_SEM)
    ngx_atomic_t  *wait;
    ngx_uint_t     semaphore;
    sem_t          sem;
#endif
#else
    ngx_fd_t       fd;
    u_char        *name;
#endif
    ngx_uint_t     spin;
} ngx_shmtx_t;


ngx_int_t ngx_shmtx_create(ngx_shmtx_t *mtx, ngx_shmtx_sh_t *addr,
    u_char *name);
void ngx_shmtx_destory(ngx_shmtx_t *mtx);
ngx_uint_t ngx_shmtx_trylock(ngx_shmtx_t *mtx);
void ngx_shmtx_lock(ngx_shmtx_t *mtx);
void ngx_shmtx_unlock(ngx_shmtx_t *mtx);
ngx_uint_t ngx_shmtx_force_unlock(ngx_shmtx_t *mtx, ngx_pid_t pid);


#endif /* _NGX_SHMTX_H_INCLUDED_ */