#include "sig-monitor.h"
#include "verbose.h"
-/* 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? */
-};
-
/* describes pending job */
struct job
{
int blocked; /* is an other request blocking this one ? */
};
+/** control of threads */
+struct thread
+{
+ struct thread *next; /**< next thread of the list */
+ struct thread *upper; /**< upper same thread */
+ struct job *job; /**< currently processed job */
+ pthread_t tid; /**< the thread id */
+ unsigned stop: 1; /**< stop requested */
+ unsigned lowered: 1; /**< has a lower same thread */
+};
+
/* synchronisation of threads */
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;
+static _Thread_local struct thread *current;
-/* add the job to the list */
-static inline void job_add(struct job *job)
+/* queue of pending jobs */
+static struct job *first_job;
+static struct job *first_evloop;
+static struct job *free_jobs;
+
+/**
+ * Create a new job with the given parameters
+ * @param group the group of the job
+ * @param timeout the timeout of the job (0 if none)
+ * @param callback the function that achieves the job
+ * @param arg1 the first argument of the callback
+ * @param arg2 the second argument of the callback
+ * @param arg3 the third argument of the callback
+ * @return the created job unblock or NULL when no more memory
+ */
+static struct job *job_create(
+ void *group,
+ int timeout,
+ void (*callback)(int, void*, void *, void*),
+ void *arg1,
+ void *arg2,
+ void *arg3)
{
- void *group = job->group;
+ struct job *job;
+
+ /* try recyle existing job */
+ job = free_jobs;
+ if (job)
+ free_jobs = job->next;
+ else {
+ /* allocation without blocking */
+ pthread_mutex_unlock(&mutex);
+ job = malloc(sizeof *job);
+ pthread_mutex_lock(&mutex);
+ if (!job) {
+ errno = -ENOMEM;
+ goto end;
+ }
+ }
+ /* initialises the job */
+ job->group = group;
+ job->timeout = timeout;
+ job->callback = callback;
+ job->arg1 = arg1;
+ job->arg2 = arg2;
+ job->arg3 = arg3;
+ job->blocked = 0;
+end:
+ return job;
+}
+
+/**
+ * Adds 'job1' and 'job2' at the end of the list of jobs, marking it
+ * as blocked if an other job with the same group is pending.
+ * @param job1 the first job to add
+ * @param job2 the second job to add or NULL
+ */
+static void job_add2(struct job *job1, struct job *job2)
+{
+ void *group1, *group2, *group;
struct job *ijob, **pjob;
+ /* prepare to add */
+ group1 = job1->group;
+ job1->next = job2;
+ if (!job2)
+ group2 = NULL;
+ else {
+ job2->next = NULL;
+ group2 = job2->group;
+ if (group2 && group2 == group1)
+ job2->blocked = 1;
+ }
+
+ /* search end and blackers */
pjob = &first_job;
ijob = first_job;
- group = job->group ? : job;
while (ijob) {
- if (ijob->group == group)
- job->blocked = 1;
+ group = ijob->group;
+ if (group) {
+ if (group == group1)
+ job1->blocked = 1;
+ if (group == group2)
+ job2->blocked = 1;
+ }
pjob = &ijob->next;
ijob = ijob->next;
}
- *pjob = job;
- job->next = NULL;
- remains--;
+
+ /* queue the jobs */
+ *pjob = job1;
}
-/* 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 isn't removed from
+ * the list of jobs.
+ * @return the job to process
+ */
static inline struct job *job_get()
{
- struct job *job, **pjob;
- pjob = &first_job;
+ struct job *job;
+
job = first_job;
- while (job && job->blocked) {
- pjob = &job->next;
+ while (job && job->blocked)
job = job->next;
- }
- if (job) {
- *pjob = job->next;
- remains++;
- }
return job;
}
-/* unblock a group of job */
-static inline void job_unblock(void *group)
+/**
+ * Releases the processed 'job'
+ * @param job the job to release
+ */
+static inline void job_release(struct job *job)
{
- struct job *job;
+ struct job *ijob, **pjob;
+ void *group;
- job = first_job;
- while (job) {
- if (job->group == group) {
- job->blocked = 0;
- break;
- }
- job = job->next;
+ /* first unqueue the job */
+ pjob = &first_job;
+ ijob = first_job;
+ while (ijob != job) {
+ pjob = &ijob->next;
+ ijob = ijob->next;
+ }
+ *pjob = job->next;
+
+ /* then unblock jobs of the same group */
+ group = job->group;
+ if (group) {
+ ijob = job->next;
+ while (ijob && ijob->group != group)
+ ijob = ijob->next;
+ if (ijob)
+ ijob->blocked = 0;
}
+
+ /* recycle the job */
+ job->next = free_jobs;
+ free_jobs = job;
}
-/* call the job */
-static inline void job_call(int signum, void *arg)
+/** 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)
+static void thread_run(struct thread *me)
{
- struct thread *me = data;
+ struct thread **prv;
struct job *job;
- me->works = 0;
- me->ended = 0;
- sig_monitor_init_timeouts();
- pthread_mutex_lock(&mutex);
+ /* init */
+ me->tid = pthread_self();
+ me->stop = 0;
+ me->lowered = 0;
+ me->upper = current;
+ if (current)
+ current->lowered = 1;
+ else
+ sig_monitor_init_timeouts();
+ current = me;
+ 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;
+ remains++;
+ job->blocked = 1;
+ me->job = job;
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--;
+
+ /* uninit */
+ prv = &threads;
+ while (*prv != me)
+ prv = &(*prv)->next;
+ *prv = me->next;
+ current = me->upper;
+ if (current)
+ current->lowered = 0;
+ else
+ sig_monitor_clean_timeouts();
+ pthread_mutex_unlock(&mutex);
+}
+
+/* main loop of processing threads */
+static void *thread_create(void *data)
+{
+ struct thread me;
+
+ pthread_mutex_lock(&mutex);
+ thread_run(&me);
pthread_mutex_unlock(&mutex);
- 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_create, NULL);
if (rc != 0) {
started--;
errno = rc;
return rc;
}
+static int start_one_thread_if_needed()
+{
+ int rc;
+
+ if (started == running && started < allowed) {
+ /* all threads are busy and a new can be started */
+ rc = start_one_thread();
+ if (rc < 0 && started == 0)
+ return rc; /* no thread available */
+ }
+ return 0;
+}
+
+int jobs_queue0(
+ void *group,
+ int timeout,
+ void (*callback)(int signum))
+{
+ return jobs_queue3(group, timeout, (void(*)(int,void*,void*,void*))callback, NULL, NULL, NULL);
+}
+
int jobs_queue(
void *group,
int timeout,
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);
+ /* check availability */
if (remains == 0) {
errno = EBUSY;
info = "too many jobs";
goto error2;
}
- if (started == running && started < allowed) {
- rc = start_one_thread();
- if (rc < 0 && started == 0) {
- /* failed to start threading */
- info = "can't start first thread";
- goto error2;
- }
+
+ /* start a thread if needed */
+ rc = start_one_thread_if_needed();
+ if (rc < 0) {
+ /* failed to start threading */
+ info = "can't start first thread";
+ goto error2;
}
- /* 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;
- job_add(job);
+ /* queues the job */
+ remains--;
+ job_add2(job, NULL);
pthread_mutex_unlock(&mutex);
/* signal an existing job */
return 0;
error2:
- pthread_mutex_unlock(&mutex);
- free(job);
+ job->next = free_jobs;
+ free_jobs = 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;
return -(started != start_count);
}
+int jobs_invoke0(
+ int timeout,
+ void (*callback)(int signum))
+{
+ return jobs_invoke3(timeout, (void(*)(int,void*,void*,void*))callback, NULL, NULL, NULL);
+}
+
+int jobs_invoke(
+ int timeout,
+ void (*callback)(int, void*),
+ void *arg)
+{
+ return jobs_invoke3(timeout, (void(*)(int,void*,void*,void*))callback, arg, NULL, NULL);
+}
+
+int jobs_invoke2(
+ int timeout,
+ void (*callback)(int, void*, void*),
+ void *arg1,
+ void *arg2)
+{
+ return jobs_invoke3(timeout, (void(*)(int,void*,void*,void*))callback, arg1, arg2, NULL);
+}
+
+static void unlock_invoker(int signum, void *arg1, void *arg2, void *arg3)
+{
+ struct thread *t = arg1;
+ pthread_mutex_lock(&mutex);
+ t->stop = 1;
+ pthread_mutex_unlock(&mutex);
+}
+
+/* invoke the job to the 'callback' using a separate thread if available */
+int jobs_invoke3(
+ int timeout,
+ void (*callback)(int, void*, void *, void*),
+ void *arg1,
+ void *arg2,
+ void *arg3)
+{
+ const char *info;
+ struct job *job1, *job2;
+ int rc;
+ struct thread me;
+
+ pthread_mutex_lock(&mutex);
+
+ /* allocates the job */
+ job1 = job_create(&me, timeout, callback, arg1, arg2, arg3);
+ job2 = job_create(&me, 0, unlock_invoker, &me, NULL, NULL);
+ if (!job1 || !job2) {
+ errno = ENOMEM;
+ info = "out of memory";
+ goto error;
+ }
+
+ /* start a thread if needed */
+ rc = start_one_thread_if_needed();
+ if (rc < 0) {
+ /* failed to start threading */
+ info = "can't start first thread";
+ goto error;
+ }
+
+ /* queues the job */
+ job_add2(job1, job2);
+
+ /* run untill stopped */
+ thread_run(&me);
+ pthread_mutex_unlock(&mutex);
+ return 0;
+
+error:
+ if (job1) {
+ job1->next = free_jobs;
+ free_jobs = job1;
+ }
+ if (job2) {
+ job2->next = free_jobs;
+ free_jobs = job2;
+ }
+ ERROR("can't process job with threads: %s, %m", info);
+ pthread_mutex_unlock(&mutex);
+ return -1;
+}
+
/* terminate all the threads and all pending requests */
void jobs_terminate()
{
- int i, n;
- struct job *job;
+ struct job *job, *head, *tail;
+ 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--;
- }
+ /* cancel pending jobs of other threads */
+ head = first_job;
+ first_job = NULL;
+ tail = NULL;
+ while (head) {
+ /* unlink the job */
+ job = head;
+ head = job->next;
+
+ /* search if job is stacked for current */
+ t = current;
+ while (t && t->job != job)
+ t = t->upper;
+ if (t) {
+ /* yes, relink it at end */
+ if (tail)
+ tail->next = job;
+ else
+ first_job = job;
+ tail = job;
+ job->next = NULL;
+ } else {
+ /* no cancel the job */
+ pthread_mutex_unlock(&mutex);
+ sig_monitor(0, job_cancel, job);
+ free(job);
+ pthread_mutex_lock(&mutex);
}
}
pthread_mutex_unlock(&mutex);
- free(threads);
-
- /* cancel pending jobs */
- while (first_job) {
- job = first_job;
- first_job = job->next;
- sig_monitor(0, job_cancel, job);
- free(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()
+{
+ struct thread me;
+
+ /* check whether already running */
+ if (current) {
+ ERROR("thread already running");
+ errno = EINVAL;
+ return -1;
+ }
+
+ /* allowed... */
+ pthread_mutex_lock(&mutex);
+ allowed++;
+ thread_run(&me);
+ allowed--;
+ pthread_mutex_unlock(&mutex);
+ return 0;
}
+
Code Review / src / app-framework-binder.git / blobdiff