Use child singleton watchdog for running the heartbeat module

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@759751 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Mladen Turk
2009-03-29 19:17:30 +00:00
parent ae1181d8f9
commit 2103ba72a1

View File

@ -21,6 +21,7 @@
#include "ap_mpm.h"
#include "scoreboard.h"
#include "mod_watchdog.h"
#ifndef HEARTBEAT_INTERVAL
#define HEARTBEAT_INTERVAL (1)
@ -35,12 +36,6 @@ typedef struct hb_ctx_t
int server_limit;
int thread_limit;
apr_status_t status;
volatile int keep_running;
apr_proc_mutex_t *mutex;
const char *mutex_path;
apr_thread_mutex_t *start_mtx;
apr_thread_t *thread;
apr_file_t *lockf;
} hb_ctx_t;
static const char *msg_format = "v=%u&ready=%u&busy=%u";
@ -117,166 +112,53 @@ static int hb_monitor(hb_ctx_t *ctx, apr_pool_t *p)
return OK;
}
#ifndef apr_time_from_msec
#define apr_time_from_msec(x) (x * 1000)
#endif
static void* APR_THREAD_FUNC hb_worker(apr_thread_t *thd, void *data)
static int hb_watchdog_init(server_rec *s, const char *name, apr_pool_t *pool)
{
apr_pool_t *tpool;
hb_ctx_t *ctx = (hb_ctx_t *) data;
apr_status_t rv;
apr_pool_t *pool = apr_thread_pool_get(thd);
apr_pool_tag(pool, "heartbeat_worker");
ctx->status = APR_SUCCESS;
ctx->keep_running = 1;
apr_thread_mutex_unlock(ctx->start_mtx);
while (ctx->keep_running) {
rv = apr_proc_mutex_trylock(ctx->mutex);
if (rv == APR_SUCCESS) {
break;
}
apr_sleep(apr_time_from_msec(200));
}
apr_pool_create(&tpool, pool);
apr_pool_tag(tpool, "heartbeat_worker_temp");
while (ctx->keep_running) {
int mpm_state = 0;
apr_pool_clear(tpool);
rv = ap_mpm_query(AP_MPMQ_MPM_STATE, &mpm_state);
if (rv != APR_SUCCESS) {
break;
}
if (mpm_state == AP_MPMQ_STOPPING) {
ctx->keep_running = 0;
break;
}
hb_monitor(ctx, tpool);
apr_sleep(apr_time_from_sec(HEARTBEAT_INTERVAL));
}
apr_pool_destroy(tpool);
apr_proc_mutex_unlock(ctx->mutex);
apr_thread_exit(ctx->thread, APR_SUCCESS);
return NULL;
}
static apr_status_t hb_pool_cleanup(void *baton)
{
apr_status_t rv;
hb_ctx_t *ctx = (hb_ctx_t *) baton;
ctx->keep_running = 0;
apr_thread_join(&rv, ctx->thread);
return rv;
}
static void start_hb_worker(apr_pool_t *p, hb_ctx_t *ctx)
{
apr_status_t rv;
rv = apr_thread_mutex_create(&ctx->start_mtx, APR_THREAD_MUTEX_UNNESTED,
p);
if (rv) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL,
"Heartbeat: apr_thread_mutex_create failed");
ctx->status = rv;
return;
}
/* This mutex fixes problems with a fast start/fast end, where the pool
* cleanup was being invoked before the thread completely spawned.
*/
apr_thread_mutex_lock(ctx->start_mtx);
apr_pool_cleanup_register(p, ctx, hb_pool_cleanup, apr_pool_cleanup_null);
rv = apr_thread_create(&ctx->thread, NULL, hb_worker, ctx, p);
if (rv) {
apr_pool_cleanup_kill(p, ctx, hb_pool_cleanup);
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL,
"Heartbeat: apr_thread_create failed");
ctx->status = rv;
}
apr_thread_mutex_lock(ctx->start_mtx);
apr_thread_mutex_unlock(ctx->start_mtx);
apr_thread_mutex_destroy(ctx->start_mtx);
}
static void hb_child_init(apr_pool_t *p, server_rec *s)
{
hb_ctx_t *ctx = ap_get_module_config(s->module_config, &heartbeat_module);
if (ctx->active) {
apr_proc_mutex_child_init(&ctx->mutex, ctx->mutex_path, p);
ctx->status = APR_EGENERAL;
start_hb_worker(p, ctx);
if (ctx->status) {
ap_log_error(APLOG_MARK, APLOG_CRIT, ctx->status, s,
"Heartbeat: Failed to start worker thread.");
return;
}
}
return;
}
static int hb_init(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp,
server_rec *s)
{
apr_lockmech_e mech;
apr_status_t rv;
hb_ctx_t *ctx = ap_get_module_config(s->module_config, &heartbeat_module);
ap_mpm_query(AP_MPMQ_HARD_LIMIT_THREADS, &ctx->thread_limit);
ap_mpm_query(AP_MPMQ_HARD_LIMIT_DAEMONS, &ctx->server_limit);
if (!ctx->active) {
return OK;
}
}
#if APR_HAS_FCNTL_SERIALIZE
mech = APR_LOCK_FCNTL;
#else
#if APR_HAS_FLOCK_SERIALIZE
mech = APR_LOCK_FLOCK;
#else
#error port me to a non crap platform.
#endif
#endif
rv = apr_proc_mutex_create(&ctx->mutex, ctx->mutex_path,
mech,
p);
if (rv) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s,
"Heartbeat: mutex failed creation at %s (type=%d)",
ctx->mutex_path, mech);
return !OK;
}
static int hb_watchdog_exit(server_rec *s, const char *name, apr_pool_t *pool)
{
apr_status_t rv;
hb_ctx_t *ctx = ap_get_module_config(s->module_config, &heartbeat_module);
return OK;
}
static int hb_watchdog_step(server_rec *s, const char *name, apr_pool_t *pool)
{
apr_status_t rv;
hb_ctx_t *ctx = ap_get_module_config(s->module_config, &heartbeat_module);
if (!ctx->active) {
return OK;
}
return hb_monitor(ctx, pool);
}
static int hb_watchdog_need(server_rec *s, const char *name,
int parent, int singleton)
{
hb_ctx_t *ctx = ap_get_module_config(s->module_config, &heartbeat_module);
if (ctx->active && singleton && !strcmp(name, AP_WATCHDOG_SINGLETON))
return OK;
else
return DECLINED;
}
static void hb_register_hooks(apr_pool_t *p)
{
ap_hook_post_config(hb_init, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_child_init(hb_child_init, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_watchdog_need(hb_watchdog_need, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_watchdog_init(hb_watchdog_init, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_watchdog_step(hb_watchdog_step, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_watchdog_exit(hb_watchdog_exit, NULL, NULL, APR_HOOK_MIDDLE);
}
static void *hb_create_config(apr_pool_t *p, server_rec *s)
@ -333,27 +215,6 @@ static const char *cmd_hb_address(cmd_parms *cmd,
return "HeartbeatAddress: apr_sockaddr_info_get failed.";
}
rv = apr_temp_dir_get(&tmpdir, cmd->temp_pool);
if (rv) {
return "HeartbeatAddress: unable to find temp directory.";
}
path = apr_pstrcat(cmd->temp_pool, tmpdir, "/hb-tmp.XXXXXX", NULL);
rv = apr_file_mktemp(&ctx->lockf, path, 0, cmd->temp_pool);
if (rv) {
return "HeartbeatAddress: unable to allocate temp file.";
}
rv = apr_file_name_get(&ctx->mutex_path, ctx->lockf);
if (rv) {
return "HeartbeatAddress: unable to get lockf name.";
}
apr_file_close(ctx->lockf);
return NULL;
}