Linux線程通訊－－訊號量（例子）

#include <stdio.h><br />#include <stdlib.h><br />#include <semaphore.h><br />#include <pthread.h></p><p>sem_t smt;</p><p>void DisplayData()<br />{<br />printf ("Display a frame/n");<br />}</p><p>void *ThreadFuncDisplay(void *arg)<br />{<br />while (1){<br />printf ("sem_wait............................../n");<br />sem_wait (&smt);<br />DisplayData();<br />}<br />}</p><p>void *ThreadFuncControl(void *arg)<br />{<br />while (1){<br />sleep (3);<br />sem_post (&smt);<br />printf ("sem_post/n");<br />}<br />}</p><p>int main(int argc, char *argv[])<br />{<br />gtk_init (&argc, &argv);</p><p>int rt;<br />pthread_tpt_dsp;<br />pthread_tpt_ctrl;</p><p>rt = sem_init (&smt, 0, 0);<br />if (rt){<br />perror ("semaphore initialization failed");<br />}</p><p>pthread_create (&pt_dsp, NULL, ThreadFuncDisplay, NULL);</p><p>pthread_create (&pt_ctrl, NULL, ThreadFuncControl, NULL);</p><p>gtk_main();</p><p>return 0;<br />}<br />