1 /*
2 * Copyright (C) 2004, 2005, 2007, 2013 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 2000, 2001, 2003 Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 /* $Id: thread.c,v 1.17 2007/06/19 23:47:18 tbox Exp $ */
19
20 /*! \file */
21
22 #include <config.h>
23
24 #if defined(HAVE_SCHED_H)
25 #include <sched.h>
26 #endif
27
28 #include <isc/thread.h>
29 #include <isc/util.h>
30
31 #ifndef THREAD_MINSTACKSIZE
32 #define THREAD_MINSTACKSIZE (1024U * 1024)
33 #endif
34
35 isc_result_t
isc_thread_create(isc_threadfunc_t func,isc_threadarg_t arg,isc_thread_t * thread)36 isc_thread_create(isc_threadfunc_t func, isc_threadarg_t arg,
37 isc_thread_t *thread)
38 {
39 pthread_attr_t attr;
40 size_t stacksize;
41 int ret;
42
43 pthread_attr_init(&attr);
44
45 #if defined(HAVE_PTHREAD_ATTR_GETSTACKSIZE) && \
46 defined(HAVE_PTHREAD_ATTR_SETSTACKSIZE)
47 ret = pthread_attr_getstacksize(&attr, &stacksize);
48 if (ret != 0)
49 return (ISC_R_UNEXPECTED);
50
51 if (stacksize < THREAD_MINSTACKSIZE) {
52 ret = pthread_attr_setstacksize(&attr, THREAD_MINSTACKSIZE);
53 if (ret != 0)
54 return (ISC_R_UNEXPECTED);
55 }
56 #endif
57
58 #if defined(PTHREAD_SCOPE_SYSTEM) && defined(NEED_PTHREAD_SCOPE_SYSTEM)
59 ret = pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
60 if (ret != 0)
61 return (ISC_R_UNEXPECTED);
62 #endif
63
64 ret = pthread_create(thread, &attr, func, arg);
65 if (ret != 0)
66 return (ISC_R_UNEXPECTED);
67
68 pthread_attr_destroy(&attr);
69
70 return (ISC_R_SUCCESS);
71 }
72
73 void
isc_thread_setconcurrency(unsigned int level)74 isc_thread_setconcurrency(unsigned int level) {
75 #if defined(CALL_PTHREAD_SETCONCURRENCY)
76 (void)pthread_setconcurrency(level);
77 #else
78 UNUSED(level);
79 #endif
80 }
81
82 void
isc_thread_yield(void)83 isc_thread_yield(void) {
84 #if defined(HAVE_SCHED_YIELD)
85 sched_yield();
86 #elif defined( HAVE_PTHREAD_YIELD)
87 pthread_yield();
88 #elif defined( HAVE_PTHREAD_YIELD_NP)
89 pthread_yield_np();
90 #endif
91 }
92