view src/core/ngx_shmtx.c @ 348:e10168d6e371 NGINX_0_6_18

nginx 0.6.18 *) Change: now the ngx_http_userid_module adds start time microseconds to the cookie field contains a pid value. *) Change: now the full request line instead of URI only is written to error_log. *) Feature: variables support in the "proxy_pass" directive. *) Feature: the "resolver" and "resolver_timeout" directives. *) Feature: now the directive "add_header last-modified ''" deletes a "Last-Modified" response header line. *) Bugfix: the "limit_rate" directive did not allow to use full throughput, even if limit value was very high.
author Igor Sysoev <http://sysoev.ru>
date Tue, 27 Nov 2007 00:00:00 +0300
parents 3dbecd747fbb
children
line wrap: on
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/*
 * Copyright (C) Igor Sysoev
 */


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


#if (NGX_HAVE_ATOMIC_OPS)


ngx_int_t
ngx_shmtx_create(ngx_shmtx_t *mtx, void *addr, u_char *name)
{
    mtx->lock = addr;

    return NGX_OK;
}

#else


ngx_int_t
ngx_shmtx_create(ngx_shmtx_t *mtx, void *addr, u_char *name)
{
    if (mtx->name) {

        if (ngx_strcmp(name, mtx->name) == 0) {
            mtx->name = name;
            return NGX_OK;
        }

        ngx_shmtx_destory(mtx);
    }

    mtx->fd = ngx_open_file(name, NGX_FILE_RDWR, NGX_FILE_CREATE_OR_OPEN,
                            NGX_FILE_DEFAULT_ACCESS);

    if (mtx->fd == NGX_INVALID_FILE) {
        ngx_log_error(NGX_LOG_EMERG, ngx_cycle->log, ngx_errno,
                      ngx_open_file_n " \"%s\" failed", name);
        return NGX_ERROR;
    }

    if (ngx_delete_file(name) == NGX_FILE_ERROR) {
        ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno,
                      ngx_delete_file_n " \"%s\" failed", name);
    }

    mtx->name = name;

    return NGX_OK;
}


void
ngx_shmtx_destory(ngx_shmtx_t *mtx)
{
    if (ngx_close_file(mtx->fd) == NGX_FILE_ERROR) {
        ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno,
                      ngx_close_file_n " \"%s\" failed", mtx->name);
    }
}


#endif