Created
December 8, 2016 08:10
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#include <pthread.h> | |
#include <stdio.h> | |
/* this function is run by the second thread */ | |
void *inc_x(void *x_void_ptr) | |
{ | |
/* increment x to 100 */ | |
int *x_ptr = (int *)x_void_ptr; | |
while(++(*x_ptr) < 100); | |
printf("x increment finished\n"); | |
/* the function must return something - NULL will do */ | |
return NULL; | |
} | |
int main() | |
{ | |
int x = 0, y = 0; | |
/* show the initial values of x and y */ | |
printf("x: %d, y: %d\n", x, y); | |
/* this variable is our reference to the second thread */ | |
pthread_t inc_x_thread; | |
/* create a second thread which executes inc_x(&x) */ | |
if(pthread_create(&inc_x_thread, NULL, inc_x, &x)) { | |
fprintf(stderr, "Error creating thread\n"); | |
return 1; | |
} | |
/* increment y to 100 in the first thread */ | |
while(++y < 100); | |
printf("y increment finished\n"); | |
/* wait for the second thread to finish */ | |
if(pthread_join(inc_x_thread, NULL)) { | |
fprintf(stderr, "Error joining thread\n"); | |
return 2; | |
} | |
/* show the results - x is now 100 thanks to the second thread */ | |
printf("x: %d, y: %d\n", x, y); | |
return 0; | |
} |
uthline
commented
Apr 27, 2022
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