| 1 | /*
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| 2 | * $Id: thread-st.h$
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| 3 | * pthread version
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| 4 | * by Wolfram Gloger 2004
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| 5 | */
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| 6 |
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| 7 | #include <pthread.h>
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| 8 | #include <stdio.h>
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| 9 |
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| 10 | pthread_cond_t finish_cond = PTHREAD_COND_INITIALIZER;
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| 11 | pthread_mutex_t finish_mutex = PTHREAD_MUTEX_INITIALIZER;
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| 12 |
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| 13 | #ifndef USE_PTHREADS_STACKS
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| 14 | #define USE_PTHREADS_STACKS 0
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| 15 | #endif
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| 16 |
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| 17 | #ifndef STACKSIZE
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| 18 | #define STACKSIZE 32768
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| 19 | #endif
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| 20 |
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| 21 | struct thread_st {
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| 22 | char *sp; /* stack pointer, can be 0 */
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| 23 | void (*func)(struct thread_st* st); /* must be set by user */
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| 24 | pthread_t id;
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| 25 | int flags;
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| 26 | struct user_data u;
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| 27 | };
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| 28 |
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| 29 | static void
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| 30 | thread_init(void)
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| 31 | {
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| 32 | printf("Using posix threads.\n");
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| 33 | pthread_cond_init(&finish_cond, NULL);
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| 34 | pthread_mutex_init(&finish_mutex, NULL);
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| 35 | }
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| 36 |
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| 37 | static void *
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| 38 | thread_wrapper(void *ptr)
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| 39 | {
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| 40 | struct thread_st *st = (struct thread_st*)ptr;
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| 41 |
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| 42 | /*printf("begin %p\n", st->sp);*/
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| 43 | st->func(st);
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| 44 | pthread_mutex_lock(&finish_mutex);
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| 45 | st->flags = 1;
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| 46 | pthread_mutex_unlock(&finish_mutex);
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| 47 | pthread_cond_signal(&finish_cond);
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| 48 | /*printf("end %p\n", st->sp);*/
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| 49 | return NULL;
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| 50 | }
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| 51 |
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| 52 | /* Create a thread. */
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| 53 | static int
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| 54 | thread_create(struct thread_st *st)
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| 55 | {
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| 56 | st->flags = 0;
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| 57 | {
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| 58 | pthread_attr_t* attr_p = 0;
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| 59 | #if USE_PTHREADS_STACKS
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| 60 | pthread_attr_t attr;
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| 61 |
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| 62 | pthread_attr_init (&attr);
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| 63 | if(!st->sp)
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| 64 | st->sp = malloc(STACKSIZE+16);
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| 65 | if(!st->sp)
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| 66 | return -1;
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| 67 | if(pthread_attr_setstacksize(&attr, STACKSIZE))
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| 68 | fprintf(stderr, "error setting stacksize");
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| 69 | else
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| 70 | pthread_attr_setstackaddr(&attr, st->sp + STACKSIZE);
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| 71 | /*printf("create %p\n", st->sp);*/
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| 72 | attr_p = &attr;
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| 73 | #endif
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| 74 | return pthread_create(&st->id, attr_p, thread_wrapper, st);
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| 75 | }
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| 76 | return 0;
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| 77 | }
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| 78 |
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| 79 | /* Wait for one of several subthreads to finish. */
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| 80 | static void
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| 81 | wait_for_thread(struct thread_st st[], int n_thr,
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| 82 | int (*end_thr)(struct thread_st*))
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| 83 | {
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| 84 | int i;
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| 85 |
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| 86 | pthread_mutex_lock(&finish_mutex);
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| 87 | for(;;) {
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| 88 | int term = 0;
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| 89 | for(i=0; i<n_thr; i++)
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| 90 | if(st[i].flags) {
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| 91 | /*printf("joining %p\n", st[i].sp);*/
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| 92 | if(pthread_join(st[i].id, NULL) == 0) {
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| 93 | st[i].flags = 0;
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| 94 | if(end_thr)
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| 95 | end_thr(&st[i]);
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| 96 | } else
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| 97 | fprintf(stderr, "can't join\n");
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| 98 | ++term;
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| 99 | }
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| 100 | if(term > 0)
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| 101 | break;
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| 102 | pthread_cond_wait(&finish_cond, &finish_mutex);
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| 103 | }
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| 104 | pthread_mutex_unlock(&finish_mutex);
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| 105 | }
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| 106 |
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| 107 | /*
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| 108 | * Local variables:
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| 109 | * tab-width: 4
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| 110 | * End:
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| 111 | */
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