2004-03-03 05:14:37 +08:00
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2004-09-28 16:34:51 +08:00
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/*
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2004-09-30 00:00:49 +08:00
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* Copyright (C) Igor Sysoev
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2004-09-28 16:34:51 +08:00
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*/
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2004-03-03 05:14:37 +08:00
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_event.h>
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static int ngx_event_busy_lock_look_cachable(ngx_event_busy_lock_t *bl,
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2005-10-19 20:33:58 +08:00
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ngx_event_busy_lock_ctx_t *ctx);
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2004-03-03 05:14:37 +08:00
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static void ngx_event_busy_lock_handler(ngx_event_t *ev);
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static void ngx_event_busy_lock_posted_handler(ngx_event_t *ev);
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/*
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* NGX_OK: the busy lock is held
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* NGX_AGAIN: the all busy locks are held but we will wait the specified time
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2004-03-30 01:43:58 +08:00
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* NGX_BUSY: ctx->timer == 0: there are many the busy locks
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* ctx->timer != 0: there are many the waiting locks
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* NGX_ERROR: an error occured while the mutex locking
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2004-03-03 05:14:37 +08:00
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*/
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2005-10-19 20:33:58 +08:00
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ngx_int_t
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ngx_event_busy_lock(ngx_event_busy_lock_t *bl, ngx_event_busy_lock_ctx_t *ctx)
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2004-03-03 05:14:37 +08:00
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{
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ngx_int_t rc;
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2005-10-19 20:33:58 +08:00
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ngx_mutex_lock(bl->mutex);
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2004-03-03 05:14:37 +08:00
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ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ctx->event->log, 0,
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"event busy lock: b:%d mb:%d",
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bl->busy, bl->max_busy);
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if (bl->busy < bl->max_busy) {
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bl->busy++;
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rc = NGX_OK;
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} else if (ctx->timer && bl->waiting < bl->max_waiting) {
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bl->waiting++;
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ngx_add_timer(ctx->event, ctx->timer);
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nginx-0.1.29-RELEASE import
*) Feature: the ngx_http_ssi_module supports "include virtual" command.
*) Feature: the ngx_http_ssi_module supports the condition command like
'if expr="$NAME"' and "else" and "endif" commands. Only one nested
level is supported.
*) Feature: the ngx_http_ssi_module supports the DATE_LOCAL and
DATE_GMT variables and "config timefmt" command.
*) Feature: the "ssi_ignore_recycled_buffers" directive.
*) Bugfix: the "echo" command did not show the default value for the
empty QUERY_STRING variable.
*) Change: the ngx_http_proxy_module was rewritten.
*) Feature: the "proxy_redirect", "proxy_pass_request_headers",
"proxy_pass_request_body", and "proxy_method" directives.
*) Feature: the "proxy_set_header" directive. The "proxy_x_var" was
canceled and must be replaced with the proxy_set_header directive.
*) Change: the "proxy_preserve_host" is canceled and must be replaced
with the "proxy_set_header Host $host" and the "proxy_redirect off"
directives, the "proxy_set_header Host $host:$proxy_port" directive
and the appropriate proxy_redirect directives.
*) Change: the "proxy_set_x_real_ip" is canceled and must be replaced
with the "proxy_set_header X-Real-IP $remote_addr" directive.
*) Change: the "proxy_add_x_forwarded_for" is canceled and must be
replaced with
the "proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for"
directive.
*) Change: the "proxy_set_x_url" is canceled and must be replaced with
the "proxy_set_header X-URL http://$host:$server_port$request_uri"
directive.
*) Feature: the "fastcgi_param" directive.
*) Change: the "fastcgi_root", "fastcgi_set_var" and "fastcgi_params"
directive are canceled and must be replaced with the fastcgi_param
directives.
*) Feature: the "index" directive can use the variables.
*) Feature: the "index" directive can be used at http and server levels.
*) Change: the last index only in the "index" directive can be absolute.
*) Feature: the "rewrite" directive can use the variables.
*) Feature: the "internal" directive.
*) Feature: the CONTENT_LENGTH, CONTENT_TYPE, REMOTE_PORT, SERVER_ADDR,
SERVER_PORT, SERVER_PROTOCOL, DOCUMENT_ROOT, SERVER_NAME,
REQUEST_METHOD, REQUEST_URI, and REMOTE_USER variables.
*) Change: nginx now passes the invalid lines in a client request
headers or a backend response header.
*) Bugfix: if the backend did not transfer response for a long time and
the "send_timeout" was less than "proxy_read_timeout", then nginx
returned the 408 response.
*) Bugfix: the segmentation fault was occurred if the backend sent an
invalid line in response header; the bug had appeared in 0.1.26.
*) Bugfix: the segmentation fault may occurred in FastCGI fault
tolerance configuration.
*) Bugfix: the "expires" directive did not remove the previous
"Expires" and "Cache-Control" headers.
*) Bugfix: nginx did not take into account trailing dot in "Host"
header line.
*) Bugfix: the ngx_http_auth_module did not work under Linux.
*) Bugfix: the rewrite directive worked incorrectly, if the arguments
were in a request.
*) Bugfix: nginx could not be built on MacOS X.
2005-05-12 22:58:06 +08:00
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ctx->event->handler = ngx_event_busy_lock_handler;
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2004-03-03 05:14:37 +08:00
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2004-06-11 02:36:57 +08:00
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if (bl->events) {
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2004-03-03 05:14:37 +08:00
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bl->last->next = ctx;
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2004-06-11 02:36:57 +08:00
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} else {
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bl->events = ctx;
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2004-03-03 05:14:37 +08:00
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}
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2004-06-11 02:36:57 +08:00
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2004-03-03 05:14:37 +08:00
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bl->last = ctx;
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rc = NGX_AGAIN;
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} else {
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rc = NGX_BUSY;
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}
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ngx_mutex_unlock(bl->mutex);
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return rc;
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}
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2005-10-19 20:33:58 +08:00
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ngx_int_t
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ngx_event_busy_lock_cachable(ngx_event_busy_lock_t *bl,
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ngx_event_busy_lock_ctx_t *ctx)
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2004-03-03 05:14:37 +08:00
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{
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ngx_int_t rc;
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2005-10-19 20:33:58 +08:00
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ngx_mutex_lock(bl->mutex);
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2004-03-03 05:14:37 +08:00
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rc = ngx_event_busy_lock_look_cachable(bl, ctx);
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ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ctx->event->log, 0,
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"event busy lock: %d w:%d mw:%d",
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rc, bl->waiting, bl->max_waiting);
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/*
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* NGX_OK: no the same request, there is free slot and we locked it
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* NGX_BUSY: no the same request and there is no free slot
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* NGX_AGAIN: the same request is processing
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*/
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if (rc == NGX_AGAIN) {
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if (ctx->timer && bl->waiting < bl->max_waiting) {
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bl->waiting++;
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ngx_add_timer(ctx->event, ctx->timer);
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nginx-0.1.29-RELEASE import
*) Feature: the ngx_http_ssi_module supports "include virtual" command.
*) Feature: the ngx_http_ssi_module supports the condition command like
'if expr="$NAME"' and "else" and "endif" commands. Only one nested
level is supported.
*) Feature: the ngx_http_ssi_module supports the DATE_LOCAL and
DATE_GMT variables and "config timefmt" command.
*) Feature: the "ssi_ignore_recycled_buffers" directive.
*) Bugfix: the "echo" command did not show the default value for the
empty QUERY_STRING variable.
*) Change: the ngx_http_proxy_module was rewritten.
*) Feature: the "proxy_redirect", "proxy_pass_request_headers",
"proxy_pass_request_body", and "proxy_method" directives.
*) Feature: the "proxy_set_header" directive. The "proxy_x_var" was
canceled and must be replaced with the proxy_set_header directive.
*) Change: the "proxy_preserve_host" is canceled and must be replaced
with the "proxy_set_header Host $host" and the "proxy_redirect off"
directives, the "proxy_set_header Host $host:$proxy_port" directive
and the appropriate proxy_redirect directives.
*) Change: the "proxy_set_x_real_ip" is canceled and must be replaced
with the "proxy_set_header X-Real-IP $remote_addr" directive.
*) Change: the "proxy_add_x_forwarded_for" is canceled and must be
replaced with
the "proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for"
directive.
*) Change: the "proxy_set_x_url" is canceled and must be replaced with
the "proxy_set_header X-URL http://$host:$server_port$request_uri"
directive.
*) Feature: the "fastcgi_param" directive.
*) Change: the "fastcgi_root", "fastcgi_set_var" and "fastcgi_params"
directive are canceled and must be replaced with the fastcgi_param
directives.
*) Feature: the "index" directive can use the variables.
*) Feature: the "index" directive can be used at http and server levels.
*) Change: the last index only in the "index" directive can be absolute.
*) Feature: the "rewrite" directive can use the variables.
*) Feature: the "internal" directive.
*) Feature: the CONTENT_LENGTH, CONTENT_TYPE, REMOTE_PORT, SERVER_ADDR,
SERVER_PORT, SERVER_PROTOCOL, DOCUMENT_ROOT, SERVER_NAME,
REQUEST_METHOD, REQUEST_URI, and REMOTE_USER variables.
*) Change: nginx now passes the invalid lines in a client request
headers or a backend response header.
*) Bugfix: if the backend did not transfer response for a long time and
the "send_timeout" was less than "proxy_read_timeout", then nginx
returned the 408 response.
*) Bugfix: the segmentation fault was occurred if the backend sent an
invalid line in response header; the bug had appeared in 0.1.26.
*) Bugfix: the segmentation fault may occurred in FastCGI fault
tolerance configuration.
*) Bugfix: the "expires" directive did not remove the previous
"Expires" and "Cache-Control" headers.
*) Bugfix: nginx did not take into account trailing dot in "Host"
header line.
*) Bugfix: the ngx_http_auth_module did not work under Linux.
*) Bugfix: the rewrite directive worked incorrectly, if the arguments
were in a request.
*) Bugfix: nginx could not be built on MacOS X.
2005-05-12 22:58:06 +08:00
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ctx->event->handler = ngx_event_busy_lock_handler;
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2004-03-03 05:14:37 +08:00
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if (bl->events == NULL) {
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bl->events = ctx;
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} else {
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bl->last->next = ctx;
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}
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bl->last = ctx;
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} else {
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rc = NGX_BUSY;
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}
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}
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ngx_mutex_unlock(bl->mutex);
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return rc;
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}
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2005-10-19 20:33:58 +08:00
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void
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ngx_event_busy_unlock(ngx_event_busy_lock_t *bl,
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ngx_event_busy_lock_ctx_t *ctx)
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2004-03-03 05:14:37 +08:00
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{
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ngx_event_t *ev;
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ngx_event_busy_lock_ctx_t *wakeup;
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2005-10-19 20:33:58 +08:00
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ngx_mutex_lock(bl->mutex);
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2004-03-03 05:14:37 +08:00
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if (bl->events) {
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wakeup = bl->events;
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bl->events = bl->events->next;
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} else {
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wakeup = NULL;
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bl->busy--;
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}
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/*
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2004-03-04 00:14:15 +08:00
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* MP: all ctx's and their queue must be in shared memory,
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* each ctx has pid to wake up
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2004-03-03 05:14:37 +08:00
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*/
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if (wakeup == NULL) {
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ngx_mutex_unlock(bl->mutex);
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2005-10-19 20:33:58 +08:00
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return;
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2004-03-03 05:14:37 +08:00
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}
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if (ctx->md5) {
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for (wakeup = bl->events; wakeup; wakeup = wakeup->next) {
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2004-03-04 00:14:15 +08:00
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if (wakeup->md5 == NULL || wakeup->slot != ctx->slot) {
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2004-03-03 05:14:37 +08:00
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continue;
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}
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wakeup->handler = ngx_event_busy_lock_posted_handler;
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wakeup->cache_updated = 1;
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ev = wakeup->event;
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2005-10-19 20:33:58 +08:00
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ngx_post_event(ev, &ngx_posted_events);
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2004-03-03 05:14:37 +08:00
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}
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ngx_mutex_unlock(bl->mutex);
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} else {
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bl->waiting--;
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ngx_mutex_unlock(bl->mutex);
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wakeup->handler = ngx_event_busy_lock_posted_handler;
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wakeup->locked = 1;
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ev = wakeup->event;
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if (ev->timer_set) {
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ngx_del_timer(ev);
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}
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2005-10-19 20:33:58 +08:00
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ngx_post_event(ev, &ngx_posted_events);
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2004-03-03 05:14:37 +08:00
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}
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}
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2005-10-19 20:33:58 +08:00
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void
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ngx_event_busy_lock_cancel(ngx_event_busy_lock_t *bl,
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ngx_event_busy_lock_ctx_t *ctx)
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2004-03-03 05:14:37 +08:00
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{
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ngx_event_busy_lock_ctx_t *c, *p;
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2005-10-19 20:33:58 +08:00
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ngx_mutex_lock(bl->mutex);
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2004-03-03 05:14:37 +08:00
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bl->waiting--;
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if (ctx == bl->events) {
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bl->events = ctx->next;
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} else {
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p = bl->events;
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for (c = bl->events->next; c; c = c->next) {
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if (c == ctx) {
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p->next = ctx->next;
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break;
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}
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p = c;
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}
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}
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ngx_mutex_unlock(bl->mutex);
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}
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2005-10-19 20:33:58 +08:00
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static ngx_int_t
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ngx_event_busy_lock_look_cachable(ngx_event_busy_lock_t *bl,
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ngx_event_busy_lock_ctx_t *ctx)
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2004-03-03 05:14:37 +08:00
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{
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ngx_int_t free;
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ngx_uint_t i, bit, cachable, mask;
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bit = 0;
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cachable = 0;
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free = -1;
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#if (NGX_SUPPRESS_WARN)
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mask = 0;
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#endif
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for (i = 0; i < bl->max_busy; i++) {
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if ((bit & 7) == 0) {
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mask = bl->md5_mask[i / 8];
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}
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if (mask & 1) {
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if (ngx_memcmp(&bl->md5[i * 16], ctx->md5, 16) == 0) {
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2004-03-04 00:14:15 +08:00
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ctx->waiting = 1;
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ctx->slot = i;
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2004-03-03 05:14:37 +08:00
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return NGX_AGAIN;
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}
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cachable++;
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} else if (free == -1) {
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free = i;
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}
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if (cachable == bl->cachable) {
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if (free == -1 && cachable < bl->max_busy) {
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free = i + 1;
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}
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break;
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}
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mask >>= 1;
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bit++;
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}
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if (free == -1) {
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return NGX_BUSY;
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}
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#if 0
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if (bl->busy == bl->max_busy) {
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return NGX_BUSY;
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}
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#endif
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ngx_memcpy(&bl->md5[free * 16], ctx->md5, 16);
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bl->md5_mask[free / 8] |= 1 << (free & 7);
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ctx->slot = free;
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bl->cachable++;
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bl->busy++;
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return NGX_OK;
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}
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2005-10-19 20:33:58 +08:00
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static void
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ngx_event_busy_lock_handler(ngx_event_t *ev)
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2004-03-03 05:14:37 +08:00
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{
|
nginx-0.1.29-RELEASE import
*) Feature: the ngx_http_ssi_module supports "include virtual" command.
*) Feature: the ngx_http_ssi_module supports the condition command like
'if expr="$NAME"' and "else" and "endif" commands. Only one nested
level is supported.
*) Feature: the ngx_http_ssi_module supports the DATE_LOCAL and
DATE_GMT variables and "config timefmt" command.
*) Feature: the "ssi_ignore_recycled_buffers" directive.
*) Bugfix: the "echo" command did not show the default value for the
empty QUERY_STRING variable.
*) Change: the ngx_http_proxy_module was rewritten.
*) Feature: the "proxy_redirect", "proxy_pass_request_headers",
"proxy_pass_request_body", and "proxy_method" directives.
*) Feature: the "proxy_set_header" directive. The "proxy_x_var" was
canceled and must be replaced with the proxy_set_header directive.
*) Change: the "proxy_preserve_host" is canceled and must be replaced
with the "proxy_set_header Host $host" and the "proxy_redirect off"
directives, the "proxy_set_header Host $host:$proxy_port" directive
and the appropriate proxy_redirect directives.
*) Change: the "proxy_set_x_real_ip" is canceled and must be replaced
with the "proxy_set_header X-Real-IP $remote_addr" directive.
*) Change: the "proxy_add_x_forwarded_for" is canceled and must be
replaced with
the "proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for"
directive.
*) Change: the "proxy_set_x_url" is canceled and must be replaced with
the "proxy_set_header X-URL http://$host:$server_port$request_uri"
directive.
*) Feature: the "fastcgi_param" directive.
*) Change: the "fastcgi_root", "fastcgi_set_var" and "fastcgi_params"
directive are canceled and must be replaced with the fastcgi_param
directives.
*) Feature: the "index" directive can use the variables.
*) Feature: the "index" directive can be used at http and server levels.
*) Change: the last index only in the "index" directive can be absolute.
*) Feature: the "rewrite" directive can use the variables.
*) Feature: the "internal" directive.
*) Feature: the CONTENT_LENGTH, CONTENT_TYPE, REMOTE_PORT, SERVER_ADDR,
SERVER_PORT, SERVER_PROTOCOL, DOCUMENT_ROOT, SERVER_NAME,
REQUEST_METHOD, REQUEST_URI, and REMOTE_USER variables.
*) Change: nginx now passes the invalid lines in a client request
headers or a backend response header.
*) Bugfix: if the backend did not transfer response for a long time and
the "send_timeout" was less than "proxy_read_timeout", then nginx
returned the 408 response.
*) Bugfix: the segmentation fault was occurred if the backend sent an
invalid line in response header; the bug had appeared in 0.1.26.
*) Bugfix: the segmentation fault may occurred in FastCGI fault
tolerance configuration.
*) Bugfix: the "expires" directive did not remove the previous
"Expires" and "Cache-Control" headers.
*) Bugfix: nginx did not take into account trailing dot in "Host"
header line.
*) Bugfix: the ngx_http_auth_module did not work under Linux.
*) Bugfix: the rewrite directive worked incorrectly, if the arguments
were in a request.
*) Bugfix: nginx could not be built on MacOS X.
2005-05-12 22:58:06 +08:00
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ev->handler = ngx_event_busy_lock_posted_handler;
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2005-10-19 20:33:58 +08:00
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ngx_post_event(ev, &ngx_posted_events);
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2004-03-03 05:14:37 +08:00
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}
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2005-10-19 20:33:58 +08:00
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static void
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ngx_event_busy_lock_posted_handler(ngx_event_t *ev)
|
2004-03-03 05:14:37 +08:00
|
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{
|
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ngx_event_busy_lock_ctx_t *ctx;
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ctx = ev->data;
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ctx->handler(ev);
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}
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