X-Git-Url: https://gerrit.automotivelinux.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fjobs.c;h=aa014f3a4b94bd2b525aca8ef4eedb9cf215c4f8;hb=b612db216c2793c34e264254794db3308d20d796;hp=936c6f1de93e827392af72d2d8069b84972a9bb4;hpb=901a38c28bf3fe7cc3e58e3fad36190fbae585be;p=src%2Fapp-framework-binder.git diff --git a/src/jobs.c b/src/jobs.c index 936c6f1d..aa014f3a 100644 --- a/src/jobs.c +++ b/src/jobs.c @@ -40,11 +40,17 @@ #define EVENT_TIMEOUT_TOP ((uint64_t)-1) #define EVENT_TIMEOUT_CHILD ((uint64_t)10000) -struct thread; - /** Internal shortcut for callback */ typedef void (*job_cb_t)(int, void*); +/** starting mode for jobs */ +enum start_mode +{ + Start_Default, /**< Start a thread if more than one jobs is pending */ + Start_Urgent, /**< Always start a thread */ + Start_Lazy /**< Never start a thread */ +}; + /** Description of a pending job */ struct job { @@ -89,19 +95,22 @@ struct sync static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; static pthread_cond_t cond = PTHREAD_COND_INITIALIZER; -/* count allowed, started and running threads */ -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; /** allowed count of waiting jobs */ +/* counts for threads */ +static int allowed_thread_count = 0; /** allowed count of threads */ +static int started_thread_count = 0; /** started count of threads */ +static int busy_thread_count = 0; /** count of busy threads */ /* list of threads */ static struct thread *threads; static _Thread_local struct thread *current_thread; +/* counts for jobs */ +static int remaining_job_count = 0; /** count of job that can be created */ +static int allowed_job_count = 0; /** allowed count of pending jobs */ + /* queue of pending jobs */ -static struct job *first_job; -static struct job *free_jobs; +static struct job *first_pending_job; +static struct job *first_free_job; /* event loop */ static struct evmgr *evmgr; @@ -125,9 +134,9 @@ static struct job *job_create( struct job *job; /* try recyle existing job */ - job = free_jobs; + job = first_free_job; if (job) - free_jobs = job->next; + first_free_job = job->next; else { /* allocation without blocking */ pthread_mutex_unlock(&mutex); @@ -165,8 +174,8 @@ static void job_add(struct job *job) job->next = NULL; /* search end and blockers */ - pjob = &first_job; - ijob = first_job; + pjob = &first_pending_job; + ijob = first_pending_job; while (ijob) { if (group && ijob->group == group) job->blocked = 1; @@ -176,7 +185,7 @@ static void job_add(struct job *job) /* queue the jobs */ *pjob = job; - remains--; + remaining_job_count--; } /** @@ -185,11 +194,11 @@ static void job_add(struct job *job) */ static inline struct job *job_get() { - struct job *job = first_job; + struct job *job = first_pending_job; while (job && job->blocked) job = job->next; if (job) - remains++; + remaining_job_count++; return job; } @@ -205,8 +214,8 @@ static inline void job_release(struct job *job) const void *group; /* first unqueue the job */ - pjob = &first_job; - ijob = first_job; + pjob = &first_pending_job; + ijob = first_pending_job; while (ijob != job) { pjob = &ijob->next; ijob = ijob->next; @@ -224,8 +233,8 @@ static inline void job_release(struct job *job) } /* recycle the job */ - job->next = free_jobs; - free_jobs = job; + job->next = first_free_job; + first_free_job = job; } /** @@ -389,18 +398,19 @@ static void thread_run_internal(volatile struct thread *me) abort(); } /* run the events */ + evmgr_prepare_run(evmgr); pthread_mutex_unlock(&mutex); sig_monitor(0, (void(*)(int,void*))evmgr_job_run, evmgr); pthread_mutex_lock(&mutex); } else { /* no job and no event loop */ - running--; - if (!running) + busy_thread_count--; + if (!busy_thread_count) ERROR("Entering job deep sleep! Check your bindings."); me->waits = 1; pthread_cond_wait(&cond, &mutex); me->waits = 0; - running++; + busy_thread_count++; } } /* cleanup */ @@ -434,13 +444,13 @@ static void thread_main() { struct thread me; - running++; - started++; + busy_thread_count++; + started_thread_count++; sig_monitor_init_timeouts(); thread_run_internal(&me); sig_monitor_clean_timeouts(); - started--; - running--; + started_thread_count--; + busy_thread_count--; } /** @@ -489,7 +499,7 @@ static int start_one_thread() * The remaining parameter is the parameter 'arg1' * given here. * @param arg The second argument for 'callback' - * @param start Allow to start a thread if not zero + * @param start The start mode for threads * @return 0 in case of success or -1 in case of error */ static int queue_job( @@ -497,46 +507,55 @@ static int queue_job( int timeout, void (*callback)(int, void*), void *arg, - int start) + enum start_mode start_mode) { struct job *job; - int rc; + int rc, busy; pthread_mutex_lock(&mutex); - /* allocates the job */ - job = job_create(group, timeout, callback, arg); - if (!job) - goto error; - /* check availability */ - if (remains <= 0) { + if (remaining_job_count <= 0) { ERROR("can't process job with threads: too many jobs"); errno = EBUSY; - goto error2; + goto error; } + /* allocates the job */ + job = job_create(group, timeout, callback, arg); + if (!job) + goto error; + /* start a thread if needed */ - if (start && running == started && started < allowed) { + busy = busy_thread_count == started_thread_count; + if (start_mode != Start_Lazy + && busy + && (start_mode == Start_Urgent || remaining_job_count + started_thread_count < allowed_job_count) + && started_thread_count < allowed_thread_count) { /* all threads are busy and a new can be started */ rc = start_one_thread(); - if (rc < 0 && started == 0) { + if (rc < 0 && started_thread_count == 0) { ERROR("can't start initial thread: %m"); goto error2; } + busy = 0; } /* queues the job */ job_add(job); + /* wakeup an evloop if needed */ + if (busy) + evloop_wakeup(); + /* signal an existing job */ pthread_cond_signal(&cond); pthread_mutex_unlock(&mutex); return 0; error2: - job->next = free_jobs; - free_jobs = job; + job->next = first_free_job; + first_free_job = job; error: pthread_mutex_unlock(&mutex); return -1; @@ -565,7 +584,59 @@ int jobs_queue( void (*callback)(int, void*), void *arg) { - return queue_job(group, timeout, callback, arg, 1); + return queue_job(group, timeout, callback, arg, Start_Default); +} + +/** + * Queues lazyly a new asynchronous job represented by 'callback' and 'arg' + * for the 'group' and the 'timeout'. + * Jobs are queued FIFO and are possibly executed in parallel + * concurrently except for job of the same group that are + * executed sequentially in FIFO order. + * @param group The group of the job or NULL when no group. + * @param timeout The maximum execution time in seconds of the job + * or 0 for unlimited time. + * @param callback The function to execute for achieving the job. + * Its first parameter is either 0 on normal flow + * or the signal number that broke the normal flow. + * The remaining parameter is the parameter 'arg1' + * given here. + * @param arg The second argument for 'callback' + * @return 0 in case of success or -1 in case of error + */ +int jobs_queue_lazy( + const void *group, + int timeout, + void (*callback)(int, void*), + void *arg) +{ + return queue_job(group, timeout, callback, arg, Start_Lazy); +} + +/** + * Queues urgently a new asynchronous job represented by 'callback' and 'arg' + * for the 'group' and the 'timeout'. + * Jobs are queued FIFO and are possibly executed in parallel + * concurrently except for job of the same group that are + * executed sequentially in FIFO order. + * @param group The group of the job or NULL when no group. + * @param timeout The maximum execution time in seconds of the job + * or 0 for unlimited time. + * @param callback The function to execute for achieving the job. + * Its first parameter is either 0 on normal flow + * or the signal number that broke the normal flow. + * The remaining parameter is the parameter 'arg1' + * given here. + * @param arg The second argument for 'callback' + * @return 0 in case of success or -1 in case of error + */ +int jobs_queue_urgent( + const void *group, + int timeout, + void (*callback)(int, void*), + void *arg) +{ + return queue_job(group, timeout, callback, arg, Start_Urgent); } /** @@ -765,7 +836,12 @@ void jobs_acquire_event_manager() * @param start The start routine to activate (can't be NULL) * @return 0 in case of success or -1 in case of error. */ -int jobs_start(int allowed_count, int start_count, int waiter_count, void (*start)(int signum, void* arg), void *arg) +int jobs_start( + int allowed_count, + int start_count, + int waiter_count, + void (*start)(int signum, void* arg), + void *arg) { int rc, launched; struct job *job; @@ -779,17 +855,18 @@ int jobs_start(int allowed_count, int start_count, int waiter_count, void (*star pthread_mutex_lock(&mutex); /* check whether already running */ - if (current_thread || allowed) { + if (current_thread || allowed_thread_count) { ERROR("thread already started"); errno = EINVAL; goto error; } /* records the allowed count */ - allowed = allowed_count; - started = 0; - running = 0; - remains = waiter_count; + allowed_thread_count = allowed_count; + started_thread_count = 0; + busy_thread_count = 0; + remaining_job_count = waiter_count; + allowed_job_count = waiter_count; /* start at least one thread: the current one */ launched = 1; @@ -837,7 +914,8 @@ void jobs_exit(void (*handler)()) t = t->next; } - /* wait the threads */ + /* wake up the threads */ + evloop_wakeup(); pthread_cond_broadcast(&cond); /* leave */