110 lines
1.6 KiB
C
110 lines
1.6 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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*/
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#ifndef _NGX_SHMTX_H_INCLUDED_
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#define _NGX_SHMTX_H_INCLUDED_
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#include <ngx_config.h>
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#include <ngx_core.h>
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typedef struct {
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#if (NGX_HAVE_ATOMIC_OPS)
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ngx_atomic_t *lock;
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#else
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ngx_fd_t fd;
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u_char *name;
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#endif
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} ngx_shmtx_t;
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ngx_int_t ngx_shmtx_create(ngx_shmtx_t *mtx, void *addr, u_char *name);
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#if (NGX_HAVE_ATOMIC_OPS)
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static ngx_inline ngx_uint_t
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ngx_shmtx_trylock(ngx_shmtx_t *mtx)
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{
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return (*mtx->lock == 0 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid));
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}
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#define ngx_shmtx_lock(mtx) ngx_spinlock((mtx)->lock, ngx_pid, 1024)
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#define ngx_shmtx_unlock(mtx) (void) ngx_atomic_cmp_set((mtx)->lock, ngx_pid, 0)
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#define ngx_shmtx_destory(mtx)
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#else
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static ngx_inline ngx_uint_t
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ngx_shmtx_trylock(ngx_shmtx_t *mtx)
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{
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ngx_err_t err;
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err = ngx_trylock_fd(mtx->fd);
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if (err == 0) {
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return 1;
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}
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if (err == NGX_EAGAIN) {
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return 0;
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}
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#if __osf__ /* Tru64 UNIX */
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if (err == NGX_EACCESS) {
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return 0;
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}
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#endif
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ngx_log_abort(err, ngx_trylock_fd_n " %s failed", mtx->name);
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return 0;
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}
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static ngx_inline void
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ngx_shmtx_lock(ngx_shmtx_t *mtx)
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{
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ngx_err_t err;
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err = ngx_lock_fd(mtx->fd);
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if (err == 0) {
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return;
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}
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ngx_log_abort(err, ngx_lock_fd_n " %s failed", mtx->name);
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}
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static ngx_inline void
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ngx_shmtx_unlock(ngx_shmtx_t *mtx)
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{
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ngx_err_t err;
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err = ngx_unlock_fd(mtx->fd);
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if (err == 0) {
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return;
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}
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ngx_log_abort(err, ngx_unlock_fd_n " %s failed", mtx->name);
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}
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void ngx_shmtx_destory(ngx_shmtx_t *mtx);
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#endif
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#endif /* _NGX_SHMTX_H_INCLUDED_ */
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