#include

#include

#include

//使用select實現精確到1微秒(0.000001秒)的sleep

void sleep_us(unsigned int nusecs)

{

struct timevaltval;

tval.tv_sec = nusecs / 1000000;

tval.tv_usec = nusecs % 1000000;

select(0, NULL, NULL, NULL, &tval);

}

int main()

{

printf("start\n");

system("date");

sleep_us(30000);//單位微妙

printf("end\n");

system("date");

return 0;

}

#include

#include

#include

#include

static void

sig_alrm(int signo)

{

/* nothing to do, just return to wake up the pause */

}

//使用 alarm 實現精確到秒的sleep，單位秒

unsigned int sleep1(unsigned int seconds)

{

if (signal(SIGALRM, sig_alrm) == SIG_ERR)

return(seconds);

alarm(seconds);/* start the timer */

pause();/* next caught signal wakes us up */

return(alarm(0));/* turn off timer, return unslept time */

}

int main()

{

printf("start sleep1\n");

system("date");

sleep1(3);

printf("end\n");

system("date");

return 0;

}

#include

#include

#include

#include

#include

static jmp_bufenv_alrm;

static void

sig_alrm(int signo)

{

longjmp(env_alrm, 1);

}

//使用setjmp 實現精確到秒的sleep，單位秒

unsigned int sleep2(unsigned int seconds)

{

if (signal(SIGALRM, sig_alrm) == SIG_ERR)

return(seconds);

if (setjmp(env_alrm) == 0) {

alarm(seconds);/* start the timer */

pause();/* next caught signal wakes us up */

}

return(alarm(0));/* turn off timer, return unslept time */

}

int main()

{

printf("start sleep2\n");

system("date");

sleep2(3);

printf("end\n");

system("date");

return 0;

}

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