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bio.c: new API bioWaitStepOfType().

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This commit is contained in:
antirez 2015-09-23 16:09:16 +02:00
parent 5b850d7a09
commit 4d50d691e3
2 changed files with 32 additions and 5 deletions
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35
src/bio.c
View File

@ -63,7 +63,8 @@
static pthread_t bio_threads[BIO_NUM_OPS];
static pthread_mutex_t bio_mutex[BIO_NUM_OPS];
static pthread_cond_t bio_condvar[BIO_NUM_OPS];
static pthread_cond_t bio_newjob_cond[BIO_NUM_OPS];
static pthread_cond_t bio_step_cond[BIO_NUM_OPS];
static list *bio_jobs[BIO_NUM_OPS];
/* The following array is used to hold the number of pending jobs for every
* OP type. This allows us to export the bioPendingJobsOfType() API that is
@ -98,7 +99,8 @@ void bioInit(void) {
/* Initialization of state vars and objects */
for (j = 0; j < BIO_NUM_OPS; j++) {
pthread_mutex_init(&bio_mutex[j],NULL);
pthread_cond_init(&bio_condvar[j],NULL);
pthread_cond_init(&bio_newjob_cond[j],NULL);
pthread_cond_init(&bio_step_cond[j],NULL);
bio_jobs[j] = listCreate();
bio_pending[j] = 0;
}
@ -133,7 +135,7 @@ void bioCreateBackgroundJob(int type, void *arg1, void *arg2, void *arg3) {
pthread_mutex_lock(&bio_mutex[type]);
listAddNodeTail(bio_jobs[type],job);
bio_pending[type]++;
pthread_cond_signal(&bio_condvar[type]);
pthread_cond_signal(&bio_newjob_cond[type]);
pthread_mutex_unlock(&bio_mutex[type]);
}
@ -168,7 +170,7 @@ void *bioProcessBackgroundJobs(void *arg) {
/* The loop always starts with the lock hold. */
if (listLength(bio_jobs[type]) == 0) {
pthread_cond_wait(&bio_condvar[type],&bio_mutex[type]);
pthread_cond_wait(&bio_newjob_cond[type],&bio_mutex[type]);
continue;
}
/* Pop the job from the queue. */
@ -188,6 +190,9 @@ void *bioProcessBackgroundJobs(void *arg) {
}
zfree(job);
/* Unblock threads blocked on bioWaitStepOfType() if any. */
pthread_cond_broadcast(&bio_step_cond[type]);
/* Lock again before reiterating the loop, if there are no longer
* jobs to process we'll block again in pthread_cond_wait(). */
pthread_mutex_lock(&bio_mutex[type]);
@ -205,6 +210,28 @@ unsigned long long bioPendingJobsOfType(int type) {
return val;
}
/* If there are pending jobs for the specified type, the function blocks
* and waits that the next job was processed. Otherwise the function
* does not block and returns ASAP.
*
* The function returns the number of jobs still to process of the
* requested type.
*
* This function is useful when from another thread, we want to wait
* a bio.c thread to do more work in a blocking way.
*/
unsigned long long bioWaitStepOfType(int type) {
unsigned long long val;
pthread_mutex_lock(&bio_mutex[type]);
val = bio_pending[type];
if (val != 0) {
pthread_cond_wait(&bio_step_cond[type],&bio_mutex[type]);
val = bio_pending[type];
}
pthread_mutex_unlock(&bio_mutex[type]);
return val;
}
/* Kill the running bio threads in an unclean way. This function should be
* used only when it's critical to stop the threads for some reason.
* Currently Redis does this only on crash (for instance on SIGSEGV) in order

2
src/bio.h
View File

@ -31,7 +31,7 @@
void bioInit(void);
void bioCreateBackgroundJob(int type, void *arg1, void *arg2, void *arg3);
unsigned long long bioPendingJobsOfType(int type);
void bioWaitPendingJobsLE(int type, unsigned long long num);
unsigned long long bioWaitStepOfType(int type);
time_t bioOlderJobOfType(int type);
void bioKillThreads(void);