#include "sig-monitor.h"
#include "verbose.h"
-/* control of threads */
+/** control of threads */
struct thread
{
- pthread_t tid; /* the thread id */
- unsigned stop: 1; /* stop request */
- unsigned ended: 1; /* ended status */
- unsigned works: 1; /* is it processing a job? */
+ struct thread *next; /**< next thread of the list */
+ pthread_t tid; /**< the thread id */
+ unsigned stop: 1; /**< stop request */
};
/* describes pending job */
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
-/* queue of pending jobs */
-static struct job *first_job = NULL;
-
/* count allowed, started and running threads */
-static int allowed = 0;
-static int started = 0;
-static int running = 0;
-static int remains = 0;
+static int allowed = 0; /** allowed count of threads */
+static int started = 0; /** started count of threads */
+static int running = 0; /** running count of threads */
+static int remains = 0; /** remaining count of jobs that can be created */
/* list of threads */
-static struct thread *threads = NULL;
+static struct thread *threads;
-/* add the job to the list */
+/* queue of pending jobs */
+static struct job *first_job;
+static struct job *first_evloop;
+static struct job *free_jobs;
+
+/**
+ * Adds the 'job' at the end of the list of jobs, marking it
+ * as blocked if an other job with the same group is pending.
+ * @param job the job to add
+ */
static inline void job_add(struct job *job)
{
- void *group = job->group;
+ void *group;
struct job *ijob, **pjob;
pjob = &first_job;
ijob = first_job;
- group = job->group ? : job;
+ group = job->group ? : (void*)(intptr_t)1;
while (ijob) {
if (ijob->group == group)
job->blocked = 1;
pjob = &ijob->next;
ijob = ijob->next;
}
- *pjob = job;
job->next = NULL;
+ *pjob = job;
remains--;
}
-/* get the next job to process or NULL if none */
+/**
+ * Get the next job to process or NULL if none.
+ * The returned job if any is removed from the list of
+ * jobs.
+ * @return the job to process
+ */
static inline struct job *job_get()
{
struct job *job, **pjob;
+
pjob = &first_job;
job = first_job;
while (job && job->blocked) {
return job;
}
-/* unblock a group of job */
+/**
+ * Unblock the first pending job of a group (if any)
+ * @param group the group to unblock
+ */
static inline void job_unblock(void *group)
{
struct job *job;
}
}
-/* call the job */
-static inline void job_call(int signum, void *arg)
+static struct job *job_create(
+ void *group,
+ int timeout,
+ void (*callback)(int, void*, void *, void*),
+ void *arg1,
+ void *arg2,
+ void *arg3)
+{
+ struct job *job;
+
+ /* allocates the job */
+ job = free_jobs;
+ if (!job) {
+ pthread_mutex_unlock(&mutex);
+ job = malloc(sizeof *job);
+ pthread_mutex_lock(&mutex);
+ if (!job) {
+ errno = -ENOMEM;
+ goto end;
+ }
+ }
+ job->group = group;
+ job->timeout = timeout;
+ job->callback = callback;
+ job->arg1 = arg1;
+ job->arg2 = arg2;
+ job->arg3 = arg3;
+ job->blocked = 0;
+end:
+ return job;
+}
+
+static inline void job_destroy(struct job *job)
+{
+ job->next = free_jobs;
+ free_jobs = job;
+}
+
+static inline void job_release(struct job *job)
+{
+ if (job->group)
+ job_unblock(job->group);
+ job_destroy(job);
+}
+
+/** monitored call to the job */
+static void job_call(int signum, void *arg)
{
struct job *job = arg;
job->callback(signum, job->arg1, job->arg2, job->arg3);
}
-/* cancel the job */
-static inline void job_cancel(int signum, void *arg)
+/** monitored cancel of the job */
+static void job_cancel(int signum, void *arg)
{
- struct job *job = arg;
- job->callback(SIGABRT, job->arg1, job->arg2, job->arg3);
+ job_call(SIGABRT, arg);
}
/* main loop of processing threads */
static void *thread_main_loop(void *data)
{
- struct thread *me = data;
+ struct thread me, **prv;
struct job *job;
- me->works = 0;
- me->ended = 0;
+ /* init */
+ me.tid = pthread_self();
+ me.stop = 0;
sig_monitor_init_timeouts();
+
+ /* chain in */
pthread_mutex_lock(&mutex);
- while (!me->stop) {
+ me.next = threads;
+ threads = &me;
+
+ /* loop until stopped */
+ running++;
+ while (!me.stop) {
/* get a job */
job = job_get();
- if (job == NULL && first_job != NULL && running == 0) {
+ if (!job && first_job && running == 0) {
/* sad situation!! should not happen */
ERROR("threads are blocked!");
job = first_job;
first_job = job->next;
}
- if (job == NULL) {
- /* no job... */
- pthread_cond_wait(&cond, &mutex);
- } else {
+ if (job) {
/* run the job */
- running++;
- me->works = 1;
pthread_mutex_unlock(&mutex);
sig_monitor(job->timeout, job_call, job);
pthread_mutex_lock(&mutex);
- me->works = 0;
- running--;
- if (job->group != NULL)
- job_unblock(job->group);
- free(job);
+ job_release(job);
+ } else {
+ /* no job, check evloop */
+ job = first_evloop;
+ if (job) {
+ /* evloop */
+ first_evloop = job->next;
+ pthread_mutex_unlock(&mutex);
+ sig_monitor(job->timeout, job_call, job);
+ pthread_mutex_lock(&mutex);
+ job->next = first_evloop;
+ first_evloop = job;
+ } else {
+ /* no job and not evloop */
+ running--;
+ pthread_cond_wait(&cond, &mutex);
+ running++;
+ }
}
-
}
- me->ended = 1;
+ running--;
+
+ /* chain out */
+ prv = &threads;
+ while (*prv != &me)
+ prv = &(*prv)->next;
+ *prv = me.next;
pthread_mutex_unlock(&mutex);
+
+ /* uninit and terminate */
sig_monitor_clean_timeouts();
- return me;
+ return NULL;
}
/* start a new thread */
static int start_one_thread()
{
- struct thread *t;
+ pthread_t tid;
int rc;
assert(started < allowed);
- t = &threads[started++];
- t->stop = 0;
- rc = pthread_create(&t->tid, NULL, thread_main_loop, t);
+ started++;
+ rc = pthread_create(&tid, NULL, thread_main_loop, NULL);
if (rc != 0) {
started--;
errno = rc;
struct job *job;
int rc;
+ pthread_mutex_lock(&mutex);
+
/* allocates the job */
- job = malloc(sizeof *job);
- if (job == NULL) {
+ job = job_create(group, timeout, callback, arg1, arg2, arg3);
+ if (!job) {
errno = ENOMEM;
info = "out of memory";
goto error;
}
/* start a thread if needed */
- pthread_mutex_lock(&mutex);
if (remains == 0) {
errno = EBUSY;
info = "too many jobs";
}
}
- /* fills and queues the job */
- job->group = group;
- job->timeout = timeout;
- job->callback = callback;
- job->arg1 = arg1;
- job->arg2 = arg2;
- job->arg3 = arg3;
- job->blocked = 0;
+ /* queues the job */
job_add(job);
pthread_mutex_unlock(&mutex);
return 0;
error2:
- pthread_mutex_unlock(&mutex);
- free(job);
+ job_destroy(job);
error:
ERROR("can't process job with threads: %s, %m", info);
+ pthread_mutex_unlock(&mutex);
return -1;
}
/* initialise the threads */
int jobs_init(int allowed_count, int start_count, int waiter_count)
{
- threads = calloc(allowed_count, sizeof *threads);
- if (threads == NULL) {
- errno = ENOMEM;
- ERROR("can't allocate threads");
- return -1;
- }
-
/* records the allowed count */
allowed = allowed_count;
started = 0;
/* terminate all the threads and all pending requests */
void jobs_terminate()
{
- int i, n;
struct job *job;
+ pthread_t me, other;
+ struct thread *t;
+
+ /* how am i? */
+ me = pthread_self();
/* request all threads to stop */
pthread_mutex_lock(&mutex);
allowed = 0;
- n = started;
- for (i = 0 ; i < n ; i++)
- threads[i].stop = 1;
-
- /* wait until all thread are terminated */
- while (started != 0) {
- /* signal threads */
+ for(;;) {
+ /* search the next thread to stop */
+ t = threads;
+ while (t && pthread_equal(t->tid, me))
+ t = t->next;
+ if (!t)
+ break;
+ /* stop it */
+ other = t->tid;
+ t->stop = 1;
pthread_mutex_unlock(&mutex);
pthread_cond_broadcast(&cond);
+ pthread_join(other, NULL);
pthread_mutex_lock(&mutex);
-
- /* join the terminated threads */
- for (i = 0 ; i < n ; i++) {
- if (threads[i].tid && threads[i].ended) {
- pthread_join(threads[i].tid, NULL);
- threads[i].tid = 0;
- started--;
- }
- }
}
- pthread_mutex_unlock(&mutex);
- free(threads);
/* cancel pending jobs */
while (first_job) {
}
}
+int jobs_add_event_loop(void *key, int timeout, void (*evloop)(int signum, void*), void *closure)
+{
+ struct job *job;
+
+ pthread_mutex_lock(&mutex);
+ job = job_create(key, timeout, (void (*)(int, void *, void *, void *))evloop, closure, NULL, NULL);
+ if (job) {
+ /* adds the loop */
+ job->next = first_evloop;
+ first_evloop = job;
+
+ /* signal the loop */
+ pthread_cond_signal(&cond);
+ }
+ pthread_mutex_unlock(&mutex);
+ return -!job;
+}
+
+int jobs_add_me()
+{
+ pthread_t me;
+ struct thread *t;
+
+ /* how am i? */
+ me = pthread_self();
+
+ /* request all threads to stop */
+ pthread_mutex_lock(&mutex);
+ t = threads;
+ while (t) {
+ if (pthread_equal(t->tid, me)) {
+ pthread_mutex_unlock(&mutex);
+ ERROR("thread already running");
+ errno = EINVAL;
+ return -1;
+ }
+ t = t->next;
+ }
+
+ /* allowed... */
+ allowed++;
+ pthread_mutex_unlock(&mutex);
+
+ /* run */
+ thread_main_loop(NULL);
+
+ /* returns */
+ pthread_mutex_lock(&mutex);
+ allowed--;
+ pthread_mutex_unlock(&mutex);
+ return 0;
+}
+
+
Code Review / src / app-framework-binder.git / commitdiff