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https://github.com/Pithikos/C-Thread-Pool
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Clean working
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pithikos
parent
2a70d4ddf8
commit
d42a436bfc
228
thpool.c
228
thpool.c
@ -10,6 +10,7 @@
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********************************/
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#include <unistd.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <pthread.h>
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@ -22,15 +23,17 @@
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#define POLLING_INTERVAL 1
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static int thpool_keepalive = 1;
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static int threads_keepalive;
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static int threads_hold_flag;
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/* Initialise thread pool */
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thpool_t* thpool_init(int threadsN){
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threads_hold_flag = 0;
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threads_keepalive = 1;
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if (threadsN < 0){
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threadsN = 0;
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}
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@ -58,13 +61,15 @@ thpool_t* thpool_init(int threadsN){
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thpool->threadsN=threadsN;
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int n;
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for (n=0; n<threadsN; n++){
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thread_t* th;
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th = &(thpool->threads[n]);
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(*th).id = n;
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args_t args;
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args.arg1 = thpool;
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args.arg2 = th;
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pthread_create(&((*th).pthread), NULL, (void *)thpool_thread_do, (args_t*)&args);
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(*th).id = n;
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pthread_create(&((*th).pthread), NULL, (void *)thread_do, (args_t*)&args);
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pthread_detach((*th).pthread);
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printf("Created thread %d in pool \n", (*th).id);
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}
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@ -72,48 +77,6 @@ thpool_t* thpool_init(int threadsN){
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}
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/* What each individual thread is doing
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* */
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static void thpool_thread_do(args_t* args){
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thpool_t* thpool;
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thread_t* thread;
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thpool = (*args).arg1;
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thread = (*args).arg2;
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(*thread).working = 0;
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while(thpool_keepalive){
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//sleep(1);
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printf("thread %d not working anymore\n", (*thread).id);
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bsem_wait(thpool->jobqueue->has_jobs);
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if (thpool_keepalive){
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/* Read job from queue and execute it */
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void*(*func_buff)(void* arg);
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void* arg_buff;
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job_t* job;
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pthread_mutex_lock(&thpool->rwmutex);
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job = jobqueue_pull(thpool);
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pthread_mutex_unlock(&thpool->rwmutex);
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if (job) {
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(*thread).working = 1;
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func_buff = job->function;
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arg_buff = job->arg;
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func_buff(arg_buff);
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free(job);
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}
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(*thread).working = 0;
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}
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}
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pthread_mutex_lock(&thpool->rwmutex);
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thpool->threadsN --;
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pthread_mutex_unlock(&thpool->rwmutex);
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}
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/* Add work to the thread pool */
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int thpool_add_work(thpool_t* thpool, void *(*function_p)(void*), void* arg_p){
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job_t* newjob;
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@ -139,35 +102,21 @@ int thpool_add_work(thpool_t* thpool, void *(*function_p)(void*), void* arg_p){
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/* Wait until all jobs in queue have finished */
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void thpool_wait(thpool_t* thpool){
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int any_threads_working(thpool_t* thpool){
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int n;
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for (n=0; n < (thpool->threadsN); n++){
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//printf("thread %d working?: %d\n", thpool->threads[n].id, thpool->threads[n].working);
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if (thpool->threads[n].working){
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return 1;
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}
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}
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return 0;
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}
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while (any_threads_working(thpool)) {
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while (thpool->jobqueue->len) {
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sleep(POLLING_INTERVAL);
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}
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}
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/* Destroy the threadpool */
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void thpool_destroy(thpool_t* thpool){
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/* End each thread's infinite loop */
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thpool_keepalive = 0;
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/* End each thread 's infinite loop */
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threads_keepalive = 0;
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int any_threads_idle(thpool_t* thpool){
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int n;
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for (n=0; n < (thpool->threadsN); n++){
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//printf("thread %d working?: %d\n", thpool->threads[n].id, thpool->threads[n].working);
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if (!thpool->threads[n].working){
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return 1;
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}
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@ -175,42 +124,21 @@ void thpool_destroy(thpool_t* thpool){
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return 0;
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}
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/* Post semaphore untill all threads have exited */
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//while (any_threads_idle(thpool)){
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// bsem_post(thpool->jobqueue->has_jobs);
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// sleep(POLLING_INTERVAL);
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//}
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/* Kill idle threads */
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double TIMEOUT = 1.0;
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time_t start, end;
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double tpassed;
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time (&start);
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while (any_threads_idle(thpool)){
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while (tpassed < TIMEOUT){
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while (any_threads_idle(thpool))
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{
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while (tpassed < TIMEOUT)
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{
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bsem_post(thpool->jobqueue->has_jobs);
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time (&end);
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tpassed = difftime(end,start);
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}
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}
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/*double TIMEOUT = 1.0;
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time_t start, end;
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double tpassed;
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time (&start);
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while (tpassed < TIMEOUT){
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bsem_post(thpool->jobqueue->has_jobs);
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time (&end);
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tpassed = difftime(end,start);
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}*/
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/* Wait for working threads to finish their work*/
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//int n;
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//for (n=0; n < (thpool->threadsN); n++){
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//pthread_join(thpool->threads[n].pthread, NULL);
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//}
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//sleep(1);
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}
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/* Job queue cleanup */
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jobqueue_destroy(thpool);
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@ -223,6 +151,126 @@ void thpool_destroy(thpool_t* thpool){
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}
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void thpool_pause(thpool_t* thpool) {
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threads_hold();
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}
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void thpool_continue(thpool_t* thpool) {
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threads_unhold();
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}
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/* ====================== THREAD OPERATIONS ========================= */
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static void threads_hold () {
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threads_hold_flag = 1;
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while (threads_hold_flag){
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sleep(1);
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}
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}
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static void threads_unhold () {
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threads_hold_flag = 0;
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}
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static void thread_suicide() {
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pthread_exit(NULL);
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}
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static void thread_kill(thread_t *th, int now) {
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if (!now && (*th).working){
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sleep(1);
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}
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pthread_kill((*th).pthread, SIGTERM);
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}
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static void signal_handler (int signum) {
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switch(signum){
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case SIGUSR1:
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threads_hold();
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break;
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case SIGUSR2:
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threads_unhold();
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break;
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case SIGTERM:
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thread_suicide();
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break;
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}
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}
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/*
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* Init point for each thread
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*
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* */
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static void thread_do(args_t* args){
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/* Assure all threads have been created before starting serving */
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thpool_t* thpool;
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thread_t* thread;
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thpool = (*args).arg1;
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thread = (*args).arg2;
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(*thread).working = 0;
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/* Register signal handler */
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struct sigaction act;
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act.sa_handler = signal_handler;
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if (sigaction(SIGUSR1, &act, NULL) == -1) {
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perror("Error: cannot handle SIGUSR1");
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}
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if (sigaction(SIGUSR2, &act, NULL) == -1) {
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perror("Error: cannot handle SIGUSR2");
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}
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if (sigaction(SIGTERM, &act, NULL) == -1) {
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perror("Error: cannot handle SIGTERM");
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}
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while(threads_keepalive){
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bsem_wait(thpool->jobqueue->has_jobs);
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(*thread).working = 1;
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if (threads_keepalive){
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/* Read job from queue and execute it */
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void*(*func_buff)(void* arg);
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void* arg_buff;
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job_t* job;
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pthread_mutex_lock(&thpool->rwmutex);
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job = jobqueue_pull(thpool);
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pthread_mutex_unlock(&thpool->rwmutex);
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if (job) {
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func_buff = job->function;
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arg_buff = job->arg;
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func_buff(arg_buff);
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free(job);
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}
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(*thread).working = 0;
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}
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}
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pthread_mutex_lock(&thpool->rwmutex);
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thpool->threadsN --;
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pthread_mutex_unlock(&thpool->rwmutex);
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printf("Thread %d exiting\n", (*thread).id);
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thread_suicide();
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}
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