1 /*
2 * Copyright (C) 2009 The Android Open Source Project
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 #include "rsSignal.h"
18
19 using namespace android;
20 using namespace android::renderscript;
21
22
Signal()23 Signal::Signal() {
24 mSet = true;
25 }
26
~Signal()27 Signal::~Signal() {
28 pthread_mutex_destroy(&mMutex);
29 pthread_cond_destroy(&mCondition);
30 }
31
init()32 bool Signal::init() {
33 int status = pthread_mutex_init(&mMutex, NULL);
34 if (status) {
35 LOGE("LocklessFifo mutex init failure");
36 return false;
37 }
38
39 status = pthread_cond_init(&mCondition, NULL);
40 if (status) {
41 LOGE("LocklessFifo condition init failure");
42 pthread_mutex_destroy(&mMutex);
43 return false;
44 }
45
46 return true;
47 }
48
set()49 void Signal::set() {
50 int status;
51
52 status = pthread_mutex_lock(&mMutex);
53 if (status) {
54 LOGE("LocklessCommandFifo: error %i locking for set condition.", status);
55 return;
56 }
57
58 mSet = true;
59
60 status = pthread_cond_signal(&mCondition);
61 if (status) {
62 LOGE("LocklessCommandFifo: error %i on set condition.", status);
63 }
64
65 status = pthread_mutex_unlock(&mMutex);
66 if (status) {
67 LOGE("LocklessCommandFifo: error %i unlocking for set condition.", status);
68 }
69 }
70
wait(uint64_t timeout)71 bool Signal::wait(uint64_t timeout) {
72 int status;
73 bool ret = false;
74
75 status = pthread_mutex_lock(&mMutex);
76 if (status) {
77 LOGE("LocklessCommandFifo: error %i locking for condition.", status);
78 return false;
79 }
80
81 if (!mSet) {
82 if (!timeout) {
83 status = pthread_cond_wait(&mCondition, &mMutex);
84 } else {
85 #if defined(HAVE_PTHREAD_COND_TIMEDWAIT_RELATIVE)
86 status = pthread_cond_timeout_np(&mCondition, &mMutex, timeout / 1000000);
87 #else
88 // This is safe it will just make things less reponsive
89 status = pthread_cond_wait(&mCondition, &mMutex);
90 #endif
91 }
92 }
93
94 if (!status) {
95 mSet = false;
96 ret = true;
97 } else {
98 if (status != ETIMEDOUT) {
99 LOGE("LocklessCommandFifo: error %i waiting for condition.", status);
100 }
101 }
102
103 status = pthread_mutex_unlock(&mMutex);
104 if (status) {
105 LOGE("LocklessCommandFifo: error %i unlocking for condition.", status);
106 }
107
108 return ret;
109 }
110
111