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Merge "libsuspend: wait for earlysuspend transition to finish"

This commit is contained in:
Colin Cross 2012-06-14 15:31:29 -07:00 committed by Android (Google) Code Review
parent b59676547f f25dd878df
commit 45eabdf2da
1 changed files with 40 additions and 2 deletions
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42
libsuspend/autosuspend_earlysuspend.c
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@ -16,6 +16,8 @@
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <stdbool.h>
#include <stddef.h>
#include <string.h>
#include <sys/types.h>
@ -31,11 +33,17 @@
#define EARLYSUSPEND_WAIT_FOR_FB_SLEEP "/sys/power/wait_for_fb_sleep"
#define EARLYSUSPEND_WAIT_FOR_FB_WAKE "/sys/power/wait_for_fb_wake"
static int sPowerStatefd;
static const char *pwr_state_mem = "mem";
static const char *pwr_state_on = "on";
static pthread_t earlysuspend_thread;
static pthread_mutex_t earlysuspend_mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t earlysuspend_cond = PTHREAD_COND_INITIALIZER;
static bool wait_for_earlysuspend;
static enum {
EARLYSUSPEND_ON,
EARLYSUSPEND_MEM,
} earlysuspend_state = EARLYSUSPEND_ON;
int wait_for_fb_wake(void)
{
@ -79,10 +87,19 @@ static void *earlysuspend_thread_func(void *arg)
ALOGE("Failed reading wait_for_fb_sleep, exiting earlysuspend thread\n");
return NULL;
}
pthread_mutex_lock(&earlysuspend_mutex);
earlysuspend_state = EARLYSUSPEND_MEM;
pthread_cond_signal(&earlysuspend_cond);
pthread_mutex_unlock(&earlysuspend_mutex);
if (wait_for_fb_wake()) {
ALOGE("Failed reading wait_for_fb_wake, exiting earlysuspend thread\n");
return NULL;
}
pthread_mutex_lock(&earlysuspend_mutex);
earlysuspend_state = EARLYSUSPEND_ON;
pthread_cond_signal(&earlysuspend_cond);
pthread_mutex_unlock(&earlysuspend_mutex);
}
}
static int autosuspend_earlysuspend_enable(void)
@ -99,6 +116,14 @@ static int autosuspend_earlysuspend_enable(void)
goto err;
}
if (wait_for_earlysuspend) {
pthread_mutex_lock(&earlysuspend_mutex);
while (earlysuspend_state != EARLYSUSPEND_MEM) {
pthread_cond_wait(&earlysuspend_cond, &earlysuspend_mutex);
}
pthread_mutex_unlock(&earlysuspend_mutex);
}
ALOGV("autosuspend_earlysuspend_enable done\n");
return 0;
@ -121,6 +146,14 @@ static int autosuspend_earlysuspend_disable(void)
goto err;
}
if (wait_for_earlysuspend) {
pthread_mutex_lock(&earlysuspend_mutex);
while (earlysuspend_state != EARLYSUSPEND_ON) {
pthread_cond_wait(&earlysuspend_cond, &earlysuspend_mutex);
}
pthread_mutex_unlock(&earlysuspend_mutex);
}
ALOGV("autosuspend_earlysuspend_disable done\n");
return 0;
@ -149,12 +182,17 @@ void start_earlysuspend_thread(void)
return;
}
wait_for_fb_wake();
ALOGI("Starting early suspend unblocker thread\n");
ret = pthread_create(&earlysuspend_thread, NULL, earlysuspend_thread_func, NULL);
if (ret) {
strerror_r(ret, buf, sizeof(buf));
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error creating thread: %s\n", buf);
return;
}
wait_for_earlysuspend = true;
}
struct autosuspend_ops *autosuspend_earlysuspend_init(void)