UNIX情形高级编程：线程私稀有据

示例代码2：

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01.#include <stdio.h>

02.#include <pthread.h>

03.#include <stdlib.h>

04.

05.typedef struct tsd_tag{

06. pthread_t thread_id;

07. char *string;

08.}tsd_t;

09.

10.pthread_key_t key;

11.pthread_once_t once = PTHREAD_ONCE_INIT;

12.

13.void once_routine(void)

14.{

15. int status;

16.

17. printf("Initializing keyn");

18. status = pthread_key_create(&key, NULL);

19. if(status != 0){

20. perror("pthread_key_create");

21. }

22.}

23.

24.void *thread_routine(void *arg)

25.{

26. int status;

27. tsd_t *value = NULL;

28.

29. status = pthread_once(&once, once_routine);

30. if(status != 0){

31. perror("pthread_once");

32. }

33.

34. value = (tsd_t *)malloc(sizeof(tsd_t));

35. if(value == NULL){

36. perror("malloc");

37. }

38.

39. status = pthread_setspecific(key, (void *)value);

40. if(status != 0){

41. perror("pthread_setspecific");

42. }

43.

44. printf("%s set tsd value at %pn", (char *)arg, value);

45. value->thread_id = pthread_self();

46. value->string = (char *)arg;

47.

48. printf("%s starting......n", (char *)arg);

49. sleep(2);

50. value = (tsd_t *)pthread_getspecific(key);

51. if(value == NULL){

52. printf("no thread-specific data value was associated

53. with keyn");

54. pthread_exit(NULL);

55. }

56. printf("%s done......n", value->string);

57.}

58.

59.int main(int argc, char **argv)

60.{

61. pthread_t thread1, thread2;

62. int status;

63.

64. status = pthread_create(&thread1, NULL, thread_routine, "thread 1");

65. if(status != 0){

66. perror("pthread_create");

67. }

68.

69. status = pthread_create(&thread2, NULL, thread_routine, "thread 2");

70. if(status != 0){

71. perror("pthread_create");

72. }

73.

74. pthread_exit(NULL);

75.}

#include <stdio.h>

#include <pthread.h>

#include <stdlib.h>

typedef struct tsd_tag{

pthread_t thread_id;

char *string;

}tsd_t;

pthread_key_t key;

pthread_once_t once = PTHREAD_ONCE_INIT;

void once_routine(void)

{

int status;

printf("Initializing keyn");

status = pthread_key_create(&key, NULL);

if(status != 0){

perror("pthread_key_create");

}

}

void *thread_routine(void *arg)

{

int status;

tsd_t *value = NULL;

status = pthread_once(&once, once_routine);

if(status != 0){

perror("pthread_once");

}

value = (tsd_t *)malloc(sizeof(tsd_t));

if(value == NULL){

perror("malloc");

}

status = pthread_setspecific(key, (void *)value);

if(status != 0){

perror("pthread_setspecific");

}

printf("%s set tsd value at %pn", (char *)arg, value);

value->thread_id = pthread_self();

value->string = (char *)arg;

printf("%s starting......n", (char *)arg);

sleep(2);

value = (tsd_t *)pthread_getspecific(key);

if(value == NULL){

printf("no thread-specific data value was associated

with keyn");

pthread_exit(NULL);

}

printf("%s done......n", value->string);

}

int main(int argc, char **argv)

{

pthread_t thread1, thread2;

int status;

status = pthread_create(&thread1, NULL, thread_routine, "thread 1");

if(status != 0){

perror("pthread_create");

}

status = pthread_create(&thread2, NULL, thread_routine, "thread 2");

if(status != 0){

perror("pthread_create");

}

pthread_exit(NULL);

}

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