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thread-st.h
1 /*
2 * $Id: thread-st.h$
3 * pthread version
4 * by Wolfram Gloger 2004
5 */
6
7 #include <pthread.h>
8 #include <stdio.h>
9
10 pthread_cond_t finish_cond = PTHREAD_COND_INITIALIZER;
11 pthread_mutex_t finish_mutex = PTHREAD_MUTEX_INITIALIZER;
12
13 #ifndef USE_PTHREADS_STACKS
14 #define USE_PTHREADS_STACKS 0
15 #endif
16
17 #ifndef STACKSIZE
18 #define STACKSIZE 32768
19 #endif
20
21 struct thread_st {
22 char *sp; /* stack pointer, can be 0 */
23 void (*func)(struct thread_st* st); /* must be set by user */
24 pthread_t id;
25 int flags;
26 struct user_data u;
27 };
28
29 static void
30 thread_init(void)
31 {
32 printf("Using posix threads.\n");
33 pthread_cond_init(&finish_cond, NULL);
34 pthread_mutex_init(&finish_mutex, NULL);
35 }
36
37 static void *
38 thread_wrapper(void *ptr)
39 {
40 struct thread_st *st = (struct thread_st*)ptr;
41
42 /*printf("begin %p\n", st->sp);*/
43 st->func(st);
44 pthread_mutex_lock(&finish_mutex);
45 st->flags = 1;
46 pthread_mutex_unlock(&finish_mutex);
47 pthread_cond_signal(&finish_cond);
48 /*printf("end %p\n", st->sp);*/
49 return NULL;
50 }
51
52 /* Create a thread. */
53 static int
54 thread_create(struct thread_st *st)
55 {
56 st->flags = 0;
57 {
58 pthread_attr_t* attr_p = 0;
59 #if USE_PTHREADS_STACKS
60 pthread_attr_t attr;
61
62 pthread_attr_init (&attr);
63 if(!st->sp)
64 st->sp = malloc(STACKSIZE+16);
65 if(!st->sp)
66 return -1;
67 if(pthread_attr_setstacksize(&attr, STACKSIZE))
68 fprintf(stderr, "error setting stacksize");
69 else
70 pthread_attr_setstackaddr(&attr, st->sp + STACKSIZE);
71 /*printf("create %p\n", st->sp);*/
72 attr_p = &attr;
73 #endif
74 return pthread_create(&st->id, attr_p, thread_wrapper, st);
75 }
76 return 0;
77 }
78
79 /* Wait for one of several subthreads to finish. */
80 static void
81 wait_for_thread(struct thread_st st[], int n_thr,
82 int (*end_thr)(struct thread_st*))
83 {
84 int i;
85
86 pthread_mutex_lock(&finish_mutex);
87 for(;;) {
88 int term = 0;
89 for(i=0; i<n_thr; i++)
90 if(st[i].flags) {
91 /*printf("joining %p\n", st[i].sp);*/
92 if(pthread_join(st[i].id, NULL) == 0) {
93 st[i].flags = 0;
94 if(end_thr)
95 end_thr(&st[i]);
96 } else
97 fprintf(stderr, "can't join\n");
98 ++term;
99 }
100 if(term > 0)
101 break;
102 pthread_cond_wait(&finish_cond, &finish_mutex);
103 }
104 pthread_mutex_unlock(&finish_mutex);
105 }
106
107 /*
108 * Local variables:
109 * tab-width: 4
110 * End:
111 */
thread_st
Definition: thread-st.h:9
user_data
Definition: t-test1.c:28