play around with threads
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parent
b12b4ff429
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1b131108dd
2 changed files with 52 additions and 2 deletions
7
Makefile
7
Makefile
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@ -2,11 +2,11 @@ CFLAGS=-std=c99 -Wall -g -O2
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INDENTOPTS=-kr --no-tabs --braces-on-func-def-line --indent-level2
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.PHONY: all
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all: approximate-pi linked-list mandelbrot
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all: approximate-pi linked-list mandelbrot threads
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.PHONY: clean
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clean:
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rm -f approximate-pi linked-list mandelbrot *~
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rm -f approximate-pi linked-list mandelbrot threads *~
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.PHONY: indent
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indent:
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@ -14,3 +14,6 @@ indent:
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mandelbrot: mandelbrot.c
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$(CC) $(CFLAGS) $(shell sdl-config --cflags) -o $@ $< $(shell sdl-config --libs) -lm
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threads: threads.c
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$(CC) $(CFLAGS) -o $@ $< -pthread
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47
threads.c
Normal file
47
threads.c
Normal file
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@ -0,0 +1,47 @@
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#include <stdio.h>
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#include <pthread.h>
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#include <stdlib.h>
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#define NUM_THREADS 10
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#define MSG_LEN 100
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struct thread_data {
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char *msg;
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};
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typedef struct thread_data thread_data_t;
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void *PrintHello(void *arg) {
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thread_data_t *td = (thread_data_t *) arg;
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printf("%s", td->msg);
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pthread_exit(NULL);
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}
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void dienomem() {
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printf("ERROR: No memory?!\n");
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exit(1);
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}
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int main(int argc, char *argv[]) {
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pthread_t threads[NUM_THREADS];
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for (int t = 0; t < NUM_THREADS; t++) {
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/* printf("Creating thread %d\n", t); */
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thread_data_t *td = malloc(sizeof(thread_data_t));
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if (!td)
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dienomem();
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td->msg = malloc(MSG_LEN);
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if (!td->msg)
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dienomem();
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snprintf(td->msg, MSG_LEN, "Hello, I'm thread %d!\n", t);
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int rc = pthread_create(&threads[t], NULL, PrintHello, (void *) td);
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if (rc) {
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printf("ERROR: return code from pthread_create() is %d\n", rc);
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exit(1);
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}
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}
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pthread_exit(NULL); /* Wait for the threads to finish. */
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}
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