1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "Camera3-Status"
#define ATRACE_TAG ATRACE_TAG_CAMERA
//#define LOG_NDEBUG 0
// This is needed for stdint.h to define INT64_MAX in C++
#define __STDC_LIMIT_MACROS
#include <utils/Log.h>
#include <utils/Trace.h>
#include <ui/Fence.h>
#include "device3/StatusTracker.h"
#include "device3/Camera3Device.h"
namespace android {
namespace camera3 {
StatusTracker::StatusTracker(wp<Camera3Device> parent) :
mComponentsChanged(false),
mParent(parent),
mNextComponentId(0),
mIdleFence(new Fence()),
mDeviceState(IDLE) {
}
StatusTracker::~StatusTracker() {
}
int StatusTracker::addComponent() {
int id;
ssize_t err;
{
Mutex::Autolock l(mLock);
id = mNextComponentId++;
ALOGV("%s: Adding new component %d", __FUNCTION__, id);
err = mStates.add(id, IDLE);
ALOGE_IF(err < 0, "%s: Can't add new component %d: %s (%d)",
__FUNCTION__, id, strerror(-err), err);
}
if (err >= 0) {
Mutex::Autolock pl(mPendingLock);
mComponentsChanged = true;
mPendingChangeSignal.signal();
}
return err < 0 ? err : id;
}
void StatusTracker::removeComponent(int id) {
ssize_t idx;
{
Mutex::Autolock l(mLock);
ALOGV("%s: Removing component %d", __FUNCTION__, id);
idx = mStates.removeItem(id);
}
if (idx >= 0) {
Mutex::Autolock pl(mPendingLock);
mComponentsChanged = true;
mPendingChangeSignal.signal();
}
return;
}
void StatusTracker::markComponentIdle(int id, const sp<Fence>& componentFence) {
markComponent(id, IDLE, componentFence);
}
void StatusTracker::markComponentActive(int id) {
markComponent(id, ACTIVE, Fence::NO_FENCE);
}
void StatusTracker::markComponent(int id, ComponentState state,
const sp<Fence>& componentFence) {
ALOGV("%s: Component %d is now %s", __FUNCTION__, id,
state == IDLE ? "idle" : "active");
Mutex::Autolock l(mPendingLock);
StateChange newState = {
id,
state,
componentFence
};
mPendingChangeQueue.add(newState);
mPendingChangeSignal.signal();
}
void StatusTracker::requestExit() {
// First mark thread dead
Thread::requestExit();
// Then exit any waits
mPendingChangeSignal.signal();
}
StatusTracker::ComponentState StatusTracker::getDeviceStateLocked() {
for (size_t i = 0; i < mStates.size(); i++) {
if (mStates.valueAt(i) == ACTIVE) {
ALOGV("%s: Component %d not idle", __FUNCTION__,
mStates.keyAt(i));
return ACTIVE;
}
}
// - If not yet signaled, getSignalTime returns INT64_MAX
// - If invalid fence or error, returns -1
// - Otherwise returns time of signalling.
// Treat -1 as 'signalled', since HAL may not be using fences, and want
// to be able to idle in case of errors.
nsecs_t signalTime = mIdleFence->getSignalTime();
bool fencesDone = signalTime != INT64_MAX;
ALOGV_IF(!fencesDone, "%s: Fences still to wait on", __FUNCTION__);
return fencesDone ? IDLE : ACTIVE;
}
bool StatusTracker::threadLoop() {
status_t res;
// Wait for state updates
{
Mutex::Autolock pl(mPendingLock);
while (mPendingChangeQueue.size() == 0 && !mComponentsChanged) {
res = mPendingChangeSignal.waitRelative(mPendingLock,
kWaitDuration);
if (exitPending()) return false;
if (res != OK) {
if (res != TIMED_OUT) {
ALOGE("%s: Error waiting on state changes: %s (%d)",
__FUNCTION__, strerror(-res), res);
}
// TIMED_OUT is expected
break;
}
}
}
// After new pending states appear, or timeout, check if we're idle. Even
// with timeout, need to check to account for fences that may still be
// clearing out
sp<Camera3Device> parent;
{
Mutex::Autolock pl(mPendingLock);
Mutex::Autolock l(mLock);
// Collect all pending state updates and see if the device
// collectively transitions between idle and active for each one
// First pass for changed components or fence completions
ComponentState prevState = getDeviceStateLocked();
if (prevState != mDeviceState) {
// Only collect changes to overall device state
mStateTransitions.add(prevState);
}
// For each pending component state update, check if we've transitioned
// to a new overall device state
for (size_t i = 0; i < mPendingChangeQueue.size(); i++) {
const StateChange &newState = mPendingChangeQueue[i];
ssize_t idx = mStates.indexOfKey(newState.id);
// Ignore notices for unknown components
if (idx >= 0) {
// Update single component state
mStates.replaceValueAt(idx, newState.state);
mIdleFence = Fence::merge(String8("idleFence"),
mIdleFence, newState.fence);
// .. and see if overall device state has changed
ComponentState newState = getDeviceStateLocked();
if (newState != prevState) {
mStateTransitions.add(newState);
}
prevState = newState;
}
}
mPendingChangeQueue.clear();
mComponentsChanged = false;
// Store final state after all pending state changes are done with
mDeviceState = prevState;
parent = mParent.promote();
}
// Notify parent for all intermediate transitions
if (mStateTransitions.size() > 0 && parent.get()) {
for (size_t i = 0; i < mStateTransitions.size(); i++) {
bool idle = (mStateTransitions[i] == IDLE);
ALOGV("Camera device is now %s", idle ? "idle" : "active");
parent->notifyStatus(idle);
}
}
mStateTransitions.clear();
return true;
}
} // namespace android
} // namespace camera3
|
