#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;
}##
Blockquote
collect2：错误：ld返回1退出状态 CMakeFiles / ex123.dir / build.make：83：目标'ex123'的配方失败 make [3]： * [ex123]错误1 CMakeFiles / Makefile2：72：目标'CMakeFiles / ex123.dir / all'的配方失败 make [2]： [CMakeFiles / ex123.dir / all]错误2 CMakeFiles / Makefile2：84：目标'CMakeFiles / ex123.dir / rule'的配方失败 make [1]： [CMakeFiles / ex123.dir / rule]错误2 Makefile：118：目标“ ex123”的配方失败 make：* [ex123]错误2