release/src/router/nginx/src/core/ngx_shmtx.h

   1
   2 /*
   3  * Copyright (C) Igor Sysoev
   4  * Copyright (C) Nginx, Inc.
   5  */
   6
   7
   8 #ifndef _NGX_SHMTX_H_INCLUDED_
   9 #define _NGX_SHMTX_H_INCLUDED_
  10
  11
  12 #include <ngx_config.h>
  13 #include <ngx_core.h>
  14
  15
  16 typedef struct {
  17     ngx_atomic_t   lock;
  18 #if (NGX_HAVE_POSIX_SEM)
  19     ngx_atomic_t   wait;
  20 #endif
  21 } ngx_shmtx_sh_t;
  22
  23
  24 typedef struct {
  25 #if (NGX_HAVE_ATOMIC_OPS)
  26     ngx_atomic_t  *lock;
  27 #if (NGX_HAVE_POSIX_SEM)
  28     ngx_atomic_t  *wait;
  29     ngx_uint_t     semaphore;
  30     sem_t          sem;
  31 #endif
  32 #else
  33     ngx_fd_t       fd;
  34     u_char        *name;
  35 #endif
  36     ngx_uint_t     spin;
  37 } ngx_shmtx_t;
  38
  39
  40 ngx_int_t ngx_shmtx_create(ngx_shmtx_t *mtx, ngx_shmtx_sh_t *addr,
  41     u_char *name);
  42 void ngx_shmtx_destroy(ngx_shmtx_t *mtx);
  43 ngx_uint_t ngx_shmtx_trylock(ngx_shmtx_t *mtx);
  44 void ngx_shmtx_lock(ngx_shmtx_t *mtx);
  45 void ngx_shmtx_unlock(ngx_shmtx_t *mtx);
  46 ngx_uint_t ngx_shmtx_force_unlock(ngx_shmtx_t *mtx, ngx_pid_t pid);
  47
  48
  49 #endif /* _NGX_SHMTX_H_INCLUDED_ */