1 /* 2 * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved. 3 * Copyright (c) 2002-2005 Mellanox Technologies LTD. All rights reserved. 4 * Copyright (c) 1996-2003 Intel Corporation. All rights reserved. 5 * 6 * This software is available to you under a choice of one of two 7 * licenses. You may choose to be licensed under the terms of the GNU 8 * General Public License (GPL) Version 2, available from the file 9 * COPYING in the main directory of this source tree, or the 10 * OpenIB.org BSD license below: 11 * 12 * Redistribution and use in source and binary forms, with or 13 * without modification, are permitted provided that the following 14 * conditions are met: 15 * 16 * - Redistributions of source code must retain the above 17 * copyright notice, this list of conditions and the following 18 * disclaimer. 19 * 20 * - Redistributions in binary form must reproduce the above 21 * copyright notice, this list of conditions and the following 22 * disclaimer in the documentation and/or other materials 23 * provided with the distribution. 24 * 25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 32 * SOFTWARE. 33 * 34 */ 35 36 #if HAVE_CONFIG_H 37 # include <config.h> 38 #endif /* HAVE_CONFIG_H */ 39 40 #include <stdio.h> 41 #include <unistd.h> 42 #include <sys/sysctl.h> 43 #include <complib/cl_thread.h> 44 45 /* 46 * Internal function to run a new user mode thread. 47 * This function is always run as a result of creation a new user mode thread. 48 * Its main job is to synchronize the creation and running of the new thread. 49 */ 50 static void *__cl_thread_wrapper(void *arg) 51 { 52 cl_thread_t *p_thread = (cl_thread_t *) arg; 53 54 CL_ASSERT(p_thread); 55 CL_ASSERT(p_thread->pfn_callback); 56 57 p_thread->pfn_callback((void *)p_thread->context); 58 59 return (NULL); 60 } 61 62 void cl_thread_construct(IN cl_thread_t * const p_thread) 63 { 64 CL_ASSERT(p_thread); 65 66 p_thread->osd.state = CL_UNINITIALIZED; 67 } 68 69 cl_status_t cl_thread_init(IN cl_thread_t * const p_thread, 70 IN cl_pfn_thread_callback_t pfn_callback, 71 IN const void *const context, 72 IN const char *const name) 73 { 74 int ret; 75 76 CL_ASSERT(p_thread); 77 78 cl_thread_construct(p_thread); 79 80 /* Initialize the thread structure */ 81 p_thread->pfn_callback = pfn_callback; 82 p_thread->context = context; 83 84 ret = pthread_create(&p_thread->osd.id, NULL, 85 __cl_thread_wrapper, (void *)p_thread); 86 87 if (ret != 0) /* pthread_create returns a "0" for success */ 88 return (CL_ERROR); 89 90 p_thread->osd.state = CL_INITIALIZED; 91 92 return (CL_SUCCESS); 93 } 94 95 void cl_thread_destroy(IN cl_thread_t * const p_thread) 96 { 97 CL_ASSERT(p_thread); 98 CL_ASSERT(cl_is_state_valid(p_thread->osd.state)); 99 100 if (p_thread->osd.state == CL_INITIALIZED) 101 pthread_join(p_thread->osd.id, NULL); 102 103 p_thread->osd.state = CL_UNINITIALIZED; 104 } 105 106 void cl_thread_suspend(IN const uint32_t pause_ms) 107 { 108 /* Convert to micro seconds */ 109 usleep(pause_ms * 1000); 110 } 111 112 void cl_thread_stall(IN const uint32_t pause_us) 113 { 114 /* 115 * Not quite a busy wait, but Linux is lacking in terms of high 116 * resolution time stamp information in user mode. 117 */ 118 usleep(pause_us); 119 } 120 121 int cl_proc_count(void) 122 { 123 int ret; 124 size_t size = sizeof(ret); 125 126 if (sysctlbyname("hw.ncpu", &ret, &size, NULL, 0) != 0 || ret < 1) 127 ret = 1; 128 return ret; 129 } 130 131 boolean_t cl_is_current_thread(IN const cl_thread_t * const p_thread) 132 { 133 pthread_t current; 134 135 CL_ASSERT(p_thread); 136 CL_ASSERT(p_thread->osd.state == CL_INITIALIZED); 137 138 current = pthread_self(); 139 return (pthread_equal(current, p_thread->osd.id)); 140 } 141