1 /*
2     Copyright (c) 2005-2020 Intel Corporation
3 
4     Licensed under the Apache License, Version 2.0 (the "License");
5     you may not use this file except in compliance with the License.
6     You may obtain a copy of the License at
7 
8         http://www.apache.org/licenses/LICENSE-2.0
9 
10     Unless required by applicable law or agreed to in writing, software
11     distributed under the License is distributed on an "AS IS" BASIS,
12     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13     See the License for the specific language governing permissions and
14     limitations under the License.
15 */
16 
17 /*
18     The original source for this example is
19     Copyright (c) 1994-2008 John E. Stone
20     All rights reserved.
21 
22     Redistribution and use in source and binary forms, with or without
23     modification, are permitted provided that the following conditions
24     are met:
25     1. Redistributions of source code must retain the above copyright
26        notice, this list of conditions and the following disclaimer.
27     2. Redistributions in binary form must reproduce the above copyright
28        notice, this list of conditions and the following disclaimer in the
29        documentation and/or other materials provided with the distribution.
30     3. The name of the author may not be used to endorse or promote products
31        derived from this software without specific prior written permission.
32 
33     THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
34     OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
35     WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
36     ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
37     DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
38     DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
39     OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
41     LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
42     OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
43     SUCH DAMAGE.
44 */
45 
46 #ifdef EMULATE_PTHREADS
47 
48 #include <assert.h>
49 #include "pthread_w.hpp"
50 
51 /*
52     Basics
53 */
54 
55 int pthread_create(pthread_t *thread,
56                    pthread_attr_t *attr,
57                    void *(*start_routine)(void *),
58                    void *arg) {
59     pthread_t th;
60 
61     if (thread == nullptr)
62         return EINVAL;
63     *thread = nullptr;
64 
65     if (start_routine == nullptr)
66         return EINVAL;
67 
68     th = (pthread_t)malloc(sizeof(pthread_s));
69     memset(th, 0, sizeof(pthread_s));
70 
71     th->winthread_handle =
72         CreateThread(nullptr, 0, (LPTHREAD_START_ROUTINE)start_routine, arg, 0, &th->winthread_id);
73     if (th->winthread_handle == nullptr)
74         return EAGAIN; /*  GetLastError()  */
75 
76     *thread = th;
77     return 0;
78 }
79 
80 int pthread_join(pthread_t th, void **thread_return) {
81     BOOL b_ret;
82     DWORD dw_ret;
83 
84     if (thread_return)
85         *thread_return = nullptr;
86 
87     if ((th == nullptr) || (th->winthread_handle == nullptr))
88         return EINVAL;
89 
90     dw_ret = WaitForSingleObject(th->winthread_handle, INFINITE);
91     if (dw_ret != WAIT_OBJECT_0)
92         return ERROR_PTHREAD; /*  dw_ret == WAIT_FAILED; GetLastError()  */
93 
94     if (thread_return) {
95         BOOL e_ret;
96         DWORD exit_val;
97         e_ret = GetExitCodeThread(th->winthread_handle, &exit_val);
98         if (!e_ret)
99             return ERROR_PTHREAD; /*  GetLastError()  */
100         *thread_return = (void *)(std::size_t)exit_val;
101     }
102 
103     b_ret = CloseHandle(th->winthread_handle);
104     if (!b_ret)
105         return ERROR_PTHREAD; /*  GetLastError()  */
106     memset(th, 0, sizeof(pthread_s));
107     free(th);
108     th = nullptr;
109 
110     return 0;
111 }
112 
113 void pthread_exit(void *retval) {
114     /*  specific to PTHREAD_TO_WINTHREAD  */
115 
116     ExitThread((DWORD)(
117         (std::size_t)retval)); /* thread becomes signalled so its death can be waited upon */
118     /*NOTREACHED*/
119     assert(0);
120     return; /* void fnc; can't return an error code */
121 }
122 
123 /*
124     Mutex
125 */
126 
127 int pthread_mutex_init(pthread_mutex_t *mutex, pthread_mutexattr_t *mutex_attr) {
128     InitializeCriticalSection(&mutex->critsec);
129     return 0;
130 }
131 
132 int pthread_mutex_destroy(pthread_mutex_t *mutex) {
133     return 0;
134 }
135 
136 int pthread_mutex_lock(pthread_mutex_t *mutex) {
137     EnterCriticalSection(&mutex->critsec);
138     return 0;
139 }
140 
141 int pthread_mutex_unlock(pthread_mutex_t *mutex) {
142     LeaveCriticalSection(&mutex->critsec);
143     return 0;
144 }
145 
146 #endif /*  EMULATE_PTHREADS  */
147