view src/os/unix/ngx_pthread_thread.c @ 34:aab2ea7c0458 NGINX_0_1_17

nginx 0.1.17 *) Change: the ngx_http_rewrite_module was rewritten from the scratch. Now it is possible to redirect, to return the error codes, to check the variables and referrers. The directives can be used inside locations. The redirect directive was canceled. *) Feature: the ngx_http_geo_module. *) Feature: the proxy_set_x_var and fastcgi_set_var directives. *) Bugfix: the location configuration with "=" modifier may be used in another location. *) Bugfix: the correct content type was set only for requests that use small caps letters in extension. *) Bugfix: if the proxy_pass or fastcgi_pass directives were set in the location, and access was denied, and the error was redirected to a static page, then the segmentation fault occurred. *) Bugfix: if in a proxied "Location" header was a relative URL, then a host name and a slash were added to them; bug appeared in 0.1.14. *) Bugfix: the system error message was not logged on Linux.
author Igor Sysoev <http://sysoev.ru>
date Thu, 03 Feb 2005 00:00:00 +0300
parents 46833bd150cb
children 72eb30262aac
line wrap: on
line source


/*
 * Copyright (C) Igor Sysoev
 */


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


static ngx_uint_t   nthreads;
static ngx_uint_t   max_threads;


static pthread_attr_t  thr_attr;


ngx_err_t ngx_create_thread(ngx_tid_t *tid, void* (*func)(void *arg), void *arg,
                            ngx_log_t *log)
{
    int  err;

    if (nthreads >= max_threads) {
        ngx_log_error(NGX_LOG_CRIT, log, 0,
                      "no more than %ui threads can be created", max_threads);
        return NGX_ERROR;
    }

    err = pthread_create(tid, &thr_attr, func, arg);

    if (err != 0) {
        ngx_log_error(NGX_LOG_ALERT, log, err, "pthread_create() failed");
        return err;
    }

    ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0,
                   "thread is created: " NGX_TID_T_FMT, *tid);

    nthreads++;

    return err;
}


ngx_int_t ngx_init_threads(int n, size_t size, ngx_cycle_t *cycle)
{   
    int  err;

    max_threads = n;

    err = pthread_attr_init(&thr_attr);

    if (err != 0) {
        ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
                      "pthread_attr_init() failed");
        return NGX_ERROR;
    }

    err = pthread_attr_setstacksize(&thr_attr, size);

    if (err != 0) {
        ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
                      "pthread_attr_setstacksize() failed");
        return NGX_ERROR;
    }

    ngx_threaded = 1;

    return NGX_OK;
}


ngx_mutex_t *ngx_mutex_init(ngx_log_t *log, ngx_uint_t flags)
{
    int           err;
    ngx_mutex_t  *m;

    if (!(m = ngx_alloc(sizeof(ngx_mutex_t), log))) {
        return NULL;
    }
    
    m->log = log;

    err = pthread_mutex_init(&m->mutex, NULL);

    if (err != 0) {
        ngx_log_error(NGX_LOG_ALERT, m->log, err,
                      "pthread_mutex_init() failed");
        return NULL;
    }

    return m;
}


void ngx_mutex_destroy(ngx_mutex_t *m)
{
    int  err;

    err = pthread_mutex_destroy(&m->mutex);

    if (err != 0) {
        ngx_log_error(NGX_LOG_ALERT, m->log, err,
                      "pthread_mutex_destroy(%p) failed", m);
    }

    ngx_free(m);
}


ngx_int_t ngx_mutex_lock(ngx_mutex_t *m)
{
    int  err;

    if (!ngx_threaded) {
        return NGX_OK;
    }

    ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "lock mutex %p", m);

    err = pthread_mutex_lock(&m->mutex);

    if (err != 0) {
        ngx_log_error(NGX_LOG_ALERT, m->log, err,
                      "pthread_mutex_lock(%p) failed", m);
        return NGX_ERROR;
    }

    ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "mutex %p is locked", m);

    return NGX_OK;
}


ngx_int_t ngx_mutex_trylock(ngx_mutex_t *m)
{
    int  err;

    if (!ngx_threaded) {
        return NGX_OK;
    }

    ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "try lock mutex %p", m);

    err = pthread_mutex_trylock(&m->mutex);

    if (err == NGX_EBUSY) {
        return NGX_AGAIN;
    }

    if (err != 0) {
        ngx_log_error(NGX_LOG_ALERT, m->log, err,
                      "pthread_mutex_trylock(%p) failed", m);
        return NGX_ERROR;
    }

    ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "mutex %p is locked", m);

    return NGX_OK;
}


ngx_int_t ngx_mutex_unlock(ngx_mutex_t *m)
{
    int  err;

    if (!ngx_threaded) {
        return NGX_OK;
    }

    ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "unlock mutex %p", m);

    err = pthread_mutex_unlock(&m->mutex);

    if (err != 0) {
        ngx_log_error(NGX_LOG_ALERT, m->log, err,
                      "pthread_mutex_unlock(%p) failed", m);
        return NGX_ERROR;
    }

    ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "mutex %p is unlocked", m);

    return NGX_OK;
}


ngx_cond_t *ngx_cond_init(ngx_log_t *log)
{
    int          err;
    ngx_cond_t  *cv;

    if (!(cv = ngx_alloc(sizeof(ngx_cond_t), log))) {
        return NULL;
    }
    
    cv->log = log;

    err = pthread_cond_init(&cv->cond, NULL);

    if (err != 0) {
        ngx_log_error(NGX_LOG_ALERT, cv->log, err,
                      "pthread_cond_init() failed");
        return NULL;
    }

    return cv;
}


void ngx_cond_destroy(ngx_cond_t *cv)
{
    int  err;

    err = pthread_cond_destroy(&cv->cond);

    if (err != 0) {
        ngx_log_error(NGX_LOG_ALERT, cv->log, err,
                      "pthread_cond_destroy(%p) failed", cv);
    }

    ngx_free(cv);
}


ngx_int_t ngx_cond_wait(ngx_cond_t *cv, ngx_mutex_t *m)
{
    int  err;

    ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0, "cv %p wait", cv);

    err = pthread_cond_wait(&cv->cond, &m->mutex);

    if (err != 0) {
        ngx_log_error(NGX_LOG_ALERT, cv->log, err,
                      "pthread_cond_wait(%p) failed", cv);
        return NGX_ERROR;
    }

    ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0, "cv %p is waked up", cv);

    ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "mutex %p is locked", m);

    return NGX_OK;
}


ngx_int_t ngx_cond_signal(ngx_cond_t *cv)
{
    int  err;

    ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0, "cv %p to signal", cv);

    err = pthread_cond_signal(&cv->cond);

    if (err != 0) {
        ngx_log_error(NGX_LOG_ALERT, cv->log, err,
                      "pthread_cond_signal(%p) failed", cv);
        return NGX_ERROR;
    }

    ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0, "cv %p is signaled", cv);

    return NGX_OK;
}