Initial Commit

src/core/ngx_shmtx.h

@@ -0,0 +1,49 @@
+
+/*
+ * 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_destroy(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_ */