#define _GNU_SOURCE
#include <stdlib.h>
+#include <stdint.h>
#include <unistd.h>
#include <signal.h>
#include <time.h>
#include <errno.h>
#include <assert.h>
+#include <systemd/sd-event.h>
+
#include "jobs.h"
#include "sig-monitor.h"
#include "verbose.h"
-/** control of threads */
+#if 0
+#define _alert_ "do you really want to remove monitoring?"
+#define sig_monitor_init_timeouts() ((void)0)
+#define sig_monitor_clean_timeouts() ((void)0)
+#define sig_monitor(to,cb,arg) (cb(0,arg))
+#endif
+
+#define EVENT_TIMEOUT_TOP ((uint64_t)-1)
+#define EVENT_TIMEOUT_CHILD ((uint64_t)10000)
+
+/** Internal shortcut for callback */
+typedef void (*job_cb_t)(int, void*);
+
+/** Description of a pending job */
+struct job
+{
+ struct job *next; /**< link to the next job enqueued */
+ const void *group; /**< group of the request */
+ job_cb_t callback; /**< processing callback */
+ void *arg; /**< argument */
+ int timeout; /**< timeout in second for processing the request */
+ unsigned blocked: 1; /**< is an other request blocking this one ? */
+ unsigned dropped: 1; /**< is removed ? */
+};
+
+/** Description of handled event loops */
+struct events
+{
+ struct events *next;
+ struct sd_event *event;
+ uint64_t timeout;
+ enum {
+ Available,
+ Modifiable,
+ Locked
+ } state;
+};
+
+/** Description of threads */
struct thread
{
- struct thread *next; /**< next thread of the list */
- pthread_t tid; /**< the thread id */
- unsigned stop: 1; /**< stop request */
+ 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 waits: 1; /**< is waiting? */
};
-/* describes pending job */
-struct job
+/**
+ * Description of synchonous callback
+ */
+struct sync
{
- struct job *next; /* link to the next job enqueued */
- void *group; /* group of the request */
- void (*callback)(int,void*,void*,void*); /* processing callback */
- void *arg1; /* first arg */
- void *arg2; /* second arg */
- void *arg3; /* second arg */
- int timeout; /* timeout in second for processing the request */
- int blocked; /* is an other request blocking this one ? */
+ struct thread thread; /**< thread loop data */
+ union {
+ void (*callback)(int, void*); /**< the synchronous callback */
+ void (*enter)(int signum, void *closure, struct jobloop *jobloop);
+ /**< the entering synchronous routine */
+ };
+ void *arg; /**< the argument of the callback */
};
+
/* synchronisation of threads */
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
-/* count allowed, started and running threads */
+/* count allowed, started and waiting 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; /** remaining count of jobs that can be created */
+static int waiting = 0; /** waiting count of threads */
+static int remains = 0; /** allowed count of waiting jobs */
+static int nevents = 0; /** count of events */
/* list of threads */
static struct thread *threads;
+static _Thread_local struct thread *current_thread;
+static _Thread_local struct events *current_events;
/* queue of pending jobs */
static struct job *first_job;
-static struct job *first_evloop;
+static struct events *first_events;
static struct job *free_jobs;
/**
- * Adds the 'job' at the end of the list of jobs, marking it
+ * 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 arg the argument of the callback
+ * @return the created job unblock or NULL when no more memory
+ */
+static struct job *job_create(
+ const void *group,
+ int timeout,
+ job_cb_t callback,
+ void *arg)
+{
+ 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->arg = arg;
+ job->blocked = 0;
+ job->dropped = 0;
+end:
+ return job;
+}
+
+/**
+ * Adds '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)
+static void job_add(struct job *job)
{
- void *group;
+ const void *group;
struct job *ijob, **pjob;
+ /* prepare to add */
+ group = job->group;
+ job->next = NULL;
+
+ /* search end and blockers */
pjob = &first_job;
ijob = first_job;
- group = job->group ? : (void*)(intptr_t)1;
while (ijob) {
- if (ijob->group == group)
+ if (group && ijob->group == group)
job->blocked = 1;
pjob = &ijob->next;
ijob = ijob->next;
}
- job->next = NULL;
+
+ /* queue the jobs */
*pjob = job;
- remains--;
}
/**
* 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
+ * @return the first job that isn't blocked or NULL
*/
static inline struct job *job_get()
{
- struct job *job, **pjob;
-
- pjob = &first_job;
- job = first_job;
- while (job && job->blocked) {
- pjob = &job->next;
+ struct job *job = first_job;
+ while (job && job->blocked)
job = job->next;
- }
- if (job) {
- *pjob = job->next;
- remains++;
- }
return job;
}
/**
- * Unblock the first pending job of a group (if any)
- * @param group the group to unblock
+ * Get the next events to process or NULL if none.
+ * @return the first events that isn't running or NULL
*/
-static inline void job_unblock(void *group)
+static inline struct events *events_get()
{
- struct job *job;
-
- job = first_job;
- while (job) {
- if (job->group == group) {
- job->blocked = 0;
- break;
- }
- job = job->next;
- }
+ struct events *events = first_events;
+ while (events && events->state != Available)
+ events = events->next;
+ return events;
}
-static struct job *job_create(
- void *group,
- int timeout,
- void (*callback)(int, void*, void *, void*),
- void *arg1,
- void *arg2,
- void *arg3)
+/**
+ * Releases the processed 'job': removes it
+ * from the list of jobs and unblock the first
+ * pending job of the same group if any.
+ * @param job the job to release
+ */
+static inline void job_release(struct job *job)
{
- struct job *job;
+ struct job *ijob, **pjob;
+ const void *group;
- /* 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;
- }
+ /* 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;
}
- 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)
-{
+ /* recycle the 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)
+/**
+ * Monitored cancel callback for a job.
+ * This function is called by the monitor
+ * to cancel the job when the safe environment
+ * is set.
+ * @param signum 0 on normal flow or the number
+ * of the signal that interrupted the normal
+ * flow, isn't used
+ * @param arg the job to run
+ */
+static void job_cancel(int signum, void *arg)
{
struct job *job = arg;
- job->callback(signum, job->arg1, job->arg2, job->arg3);
+ job->callback(SIGABRT, job->arg);
}
-/** monitored cancel of the job */
-static void job_cancel(int signum, void *arg)
+/**
+ * Monitored normal callback for events.
+ * This function is called by the monitor
+ * to run the event loop when the safe environment
+ * is set.
+ * @param signum 0 on normal flow or the number
+ * of the signal that interrupted the normal
+ * flow
+ * @param arg the events to run
+ */
+static void events_call(int signum, void *arg)
{
- job_call(SIGABRT, arg);
+ int rc;
+ struct sd_event *se;
+ struct events *events = arg;
+
+ if (!signum) {
+ se = events->event;
+ rc = sd_event_prepare(se);
+ if (rc < 0) {
+ errno = -rc;
+ ERROR("sd_event_prepare returned an error (state: %d): %m", sd_event_get_state(events->event));
+ } else {
+ if (rc == 0) {
+ rc = sd_event_wait(se, events->timeout);
+ if (rc < 0) {
+ errno = -rc;
+ ERROR("sd_event_wait returned an error (state: %d): %m", sd_event_get_state(events->event));
+ }
+ }
+
+ if (rc > 0) {
+ rc = sd_event_dispatch(se);
+ if (rc < 0) {
+ errno = -rc;
+ ERROR("sd_event_dispatch returned an error (state: %d): %m", sd_event_get_state(events->event));
+ }
+ }
+ }
+ }
}
-/* main loop of processing threads */
-static void *thread_main_loop(void *data)
+/**
+ * Main processing loop of threads processing jobs.
+ * The loop must be called with the mutex locked
+ * and it returns with the mutex locked.
+ * @param me the description of the thread to use
+ * TODO: how are timeout handled when reentering?
+ */
+static void thread_run(volatile struct thread *me)
{
- struct thread me, **prv;
+ struct thread **prv;
struct job *job;
-
- /* init */
- me.tid = pthread_self();
- me.stop = 0;
- sig_monitor_init_timeouts();
-
- /* chain in */
- pthread_mutex_lock(&mutex);
- me.next = threads;
- threads = &me;
+ struct events *events;
+ uint64_t evto;
+
+ /* initialize description of itself and link it in the list */
+ me->tid = pthread_self();
+ me->stop = 0;
+ me->waits = 0;
+ me->upper = current_thread;
+ if (current_thread) {
+ evto = EVENT_TIMEOUT_CHILD;
+ } else {
+ started++;
+ sig_monitor_init_timeouts();
+ evto = EVENT_TIMEOUT_TOP;
+ }
+ me->next = threads;
+ threads = (struct thread*)me;
+ current_thread = (struct thread*)me;
/* loop until stopped */
- running++;
- while (!me.stop) {
+ while (!me->stop) {
/* get a job */
- job = job_get();
- if (!job && first_job && running == 0) {
- /* sad situation!! should not happen */
- ERROR("threads are blocked!");
- job = first_job;
- first_job = job->next;
- }
+ job = job_get(first_job);
if (job) {
+ /* prepare running the job */
+ remains++; /* increases count of job that can wait */
+ job->blocked = 1; /* mark job as blocked */
+ me->job = job; /* record the job (only for terminate) */
+
/* run the job */
pthread_mutex_unlock(&mutex);
- sig_monitor(job->timeout, job_call, job);
+ sig_monitor(job->timeout, job->callback, job->arg);
pthread_mutex_lock(&mutex);
+
+ /* release event if any */
+ events = current_events;
+ if (events && events->state == Modifiable) {
+ current_events = NULL;
+ events->state = Available;
+ }
+
+ /* release the run job */
job_release(job);
} else {
- /* no job, check evloop */
- job = first_evloop;
- if (job) {
- /* evloop */
- first_evloop = job->next;
+ /* no job, check events */
+ events = current_events;
+ if (!events)
+ events = events_get();
+ else if (events->state == Locked) {
+ events = 0;
+ WARNING("Loosing an event loop because reentering");
+ }
+ if (events) {
+ /* run the events */
+ events->state = Locked;
+ events->timeout = evto;
+ current_events = events;
pthread_mutex_unlock(&mutex);
- sig_monitor(job->timeout, job_call, job);
+ sig_monitor(0, events_call, events);
pthread_mutex_lock(&mutex);
- job->next = first_evloop;
- first_evloop = job;
+ current_events = NULL;
+ events->state = Available;
} else {
- /* no job and not evloop */
- running--;
+ /* no job and not events */
+ waiting++;
+ me->waits = 1;
pthread_cond_wait(&cond, &mutex);
- running++;
+ me->waits = 0;
+ waiting--;
}
}
}
- running--;
- /* chain out */
+ /* unlink the current thread and cleanup */
prv = &threads;
- while (*prv != &me)
+ while (*prv != me)
prv = &(*prv)->next;
- *prv = me.next;
- pthread_mutex_unlock(&mutex);
+ *prv = me->next;
+ current_thread = me->upper;
+ if (!current_thread) {
+ sig_monitor_clean_timeouts();
+ started--;
+ }
+}
+
+/**
+ * Entry point for created threads.
+ * @param data not used
+ * @return NULL
+ */
+static void *thread_main(void *data)
+{
+ struct thread me;
- /* uninit and terminate */
- sig_monitor_clean_timeouts();
+ pthread_mutex_lock(&mutex);
+ thread_run(&me);
+ pthread_mutex_unlock(&mutex);
return NULL;
}
-/* start a new thread */
+/**
+ * Starts a new thread
+ * @return 0 in case of success or -1 in case of error
+ */
static int start_one_thread()
{
pthread_t tid;
int rc;
- assert(started < allowed);
-
- started++;
- rc = pthread_create(&tid, NULL, thread_main_loop, NULL);
+ rc = pthread_create(&tid, NULL, thread_main, NULL);
if (rc != 0) {
- started--;
- errno = rc;
+ /* errno = rc; */
WARNING("not able to start thread: %m");
rc = -1;
}
return rc;
}
+/**
+ * Queues 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(
- void *group,
+ const void *group,
int timeout,
void (*callback)(int, void*),
void *arg)
-{
- return jobs_queue3(group, timeout, (void(*)(int,void*,void*,void*))callback, arg, NULL, NULL);
-}
-
-int jobs_queue2(
- void *group,
- int timeout,
- void (*callback)(int, void*, void*),
- void *arg1,
- void *arg2)
-{
- return jobs_queue3(group, timeout, (void(*)(int,void*,void*,void*))callback, arg1, arg2, NULL);
-}
-
-/* queue the job to the 'callback' using a separate thread if available */
-int jobs_queue3(
- void *group,
- int timeout,
- void (*callback)(int, void*, void *, void*),
- void *arg1,
- void *arg2,
- void *arg3)
{
const char *info;
struct job *job;
pthread_mutex_lock(&mutex);
/* allocates the job */
- job = job_create(group, timeout, callback, arg1, arg2, arg3);
+ job = job_create(group, timeout, callback, arg);
if (!job) {
errno = ENOMEM;
info = "out of memory";
goto error;
}
- /* start a thread if needed */
+ /* check availability */
if (remains == 0) {
errno = EBUSY;
info = "too many jobs";
goto error2;
}
- if (started == running && started < allowed) {
+
+ /* start a thread if needed */
+ if (waiting == 0 && started < allowed) {
+ /* all threads are busy and a new can be started */
rc = start_one_thread();
if (rc < 0 && started == 0) {
- /* failed to start threading */
info = "can't start first thread";
goto error2;
}
}
/* queues the job */
+ remains--;
job_add(job);
- pthread_mutex_unlock(&mutex);
/* signal an existing job */
pthread_cond_signal(&cond);
+ pthread_mutex_unlock(&mutex);
return 0;
error2:
- job_destroy(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)
+/**
+ * Internal helper function for 'jobs_enter'.
+ * @see jobs_enter, jobs_leave
+ */
+static void enter_cb(int signum, void *closure)
{
- /* records the allowed count */
- allowed = allowed_count;
- started = 0;
- running = 0;
- remains = waiter_count;
+ struct sync *sync = closure;
+ sync->enter(signum, sync->arg, (void*)&sync->thread);
+}
+
+/**
+ * Internal helper function for 'jobs_call'.
+ * @see jobs_call
+ */
+static void call_cb(int signum, void *closure)
+{
+ struct sync *sync = closure;
+ sync->callback(signum, sync->arg);
+ jobs_leave((void*)&sync->thread);
+}
+
+/**
+ * Internal helper for synchronous jobs. It enters
+ * a new thread loop for evaluating the given job
+ * as recorded by the couple 'sync_cb' and 'sync'.
+ * @see jobs_call, jobs_enter, jobs_leave
+ */
+static int do_sync(
+ const void *group,
+ int timeout,
+ void (*sync_cb)(int signum, void *closure),
+ struct sync *sync
+)
+{
+ struct job *job;
- /* start at least one thread */
pthread_mutex_lock(&mutex);
- while (started < start_count && start_one_thread() == 0);
+
+ /* allocates the job */
+ job = job_create(group, timeout, sync_cb, sync);
+ if (!job) {
+ ERROR("out of memory");
+ errno = ENOMEM;
+ pthread_mutex_unlock(&mutex);
+ return -1;
+ }
+
+ /* queues the job */
+ job_add(job);
+
+ /* run until stopped */
+ thread_run(&sync->thread);
pthread_mutex_unlock(&mutex);
+ return 0;
+}
- /* end */
- return -(started != start_count);
+/**
+ * Enter a synchronisation point: activates the job given by 'callback'
+ * and 'closure' using 'group' and 'timeout' to control sequencing and
+ * execution time.
+ * @param group the group for sequencing jobs
+ * @param timeout the time in seconds allocated to the job
+ * @param callback the callback that will handle the job.
+ * it receives 3 parameters: 'signum' that will be 0
+ * on normal flow or the catched signal number in case
+ * of interrupted flow, the context 'closure' as given and
+ * a 'jobloop' reference that must be used when the job is
+ * terminated to unlock the current execution flow.
+ * @param arg the argument to the callback
+ * @return 0 on success or -1 in case of error
+ */
+int jobs_enter(
+ const void *group,
+ int timeout,
+ void (*callback)(int signum, void *closure, struct jobloop *jobloop),
+ void *closure
+)
+{
+ struct sync sync;
+
+ sync.enter = callback;
+ sync.arg = closure;
+ return do_sync(group, timeout, enter_cb, &sync);
}
-/* terminate all the threads and all pending requests */
-void jobs_terminate()
+/**
+ * Unlocks the execution flow designed by 'jobloop'.
+ * @param jobloop indication of the flow to unlock
+ * @return 0 in case of success of -1 on error
+ */
+int jobs_leave(struct jobloop *jobloop)
{
- 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;
- 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 = threads;
+ while (t && t != (struct thread*)jobloop)
+ t = t->next;
+ if (!t) {
+ errno = EINVAL;
+ } else {
t->stop = 1;
- pthread_mutex_unlock(&mutex);
- pthread_cond_broadcast(&cond);
- pthread_join(other, NULL);
- pthread_mutex_lock(&mutex);
+ if (t->waits)
+ pthread_cond_broadcast(&cond);
}
+ pthread_mutex_unlock(&mutex);
+ return -!t;
+}
+
+/**
+ * Calls synchronously the job represented by 'callback' and 'arg1'
+ * for the 'group' and the 'timeout' and waits for its completion.
+ * @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_call(
+ const void *group,
+ int timeout,
+ void (*callback)(int, void*),
+ void *arg)
+{
+ struct sync sync;
+
+ sync.callback = callback;
+ sync.arg = arg;
- /* cancel pending jobs */
- while (first_job) {
- job = first_job;
- first_job = job->next;
- sig_monitor(0, job_cancel, job);
- free(job);
+ return do_sync(group, timeout, call_cb, &sync);
+}
+
+/**
+ * Gets a sd_event item for the current thread.
+ * @return a sd_event or NULL in case of error
+ */
+struct sd_event *jobs_get_sd_event()
+{
+ struct events *events;
+ int rc;
+
+ pthread_mutex_lock(&mutex);
+
+ /* search events on stack */
+ events = current_events;
+ if (!events) {
+ /* search an available events */
+ events = events_get();
+ if (!events) {
+ /* not found, check if creation possible */
+ if (nevents >= allowed) {
+ ERROR("not possible to add a new event");
+ events = NULL;
+ } else {
+ events = malloc(sizeof *events);
+ if (events && (rc = sd_event_new(&events->event)) >= 0) {
+ if (nevents < started || start_one_thread() >= 0) {
+ events->state = Available;
+ events->next = first_events;
+ first_events = events;
+ } else {
+ ERROR("can't start thread for events");
+ sd_event_unref(events->event);
+ free(events);
+ events = NULL;
+ }
+ } else {
+ if (!events) {
+ ERROR("out of memory");
+ errno = ENOMEM;
+ } else {
+ free(events);
+ ERROR("creation of sd_event failed: %m");
+ events = NULL;
+ errno = -rc;
+ }
+ }
+ }
+ }
+ if (events) {
+ events->state = Modifiable;
+ if (!current_thread)
+ WARNING("event returned for unknown thread!");
+ current_events = events;
+ }
}
+ pthread_mutex_unlock(&mutex);
+ return events ? events->event : NULL;
}
-int jobs_add_event_loop(void *key, int timeout, void (*evloop)(int signum, void*), void *closure)
+/**
+ * Enter the jobs processing loop.
+ * @param allowed_count Maximum count of thread for jobs including this one
+ * @param start_count Count of thread to start now, must be lower.
+ * @param waiter_count Maximum count of jobs that can be waiting.
+ * @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))
{
+ int rc, launched;
+ struct thread me;
struct job *job;
+ assert(allowed_count >= 1);
+ assert(start_count >= 0);
+ assert(waiter_count > 0);
+ assert(start_count <= allowed_count);
+
+ rc = -1;
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);
+
+ /* check whether already running */
+ if (current_thread || allowed) {
+ ERROR("thread already started");
+ errno = EINVAL;
+ goto error;
+ }
+
+ /* start */
+ if (sig_monitor_init() < 0) {
+ ERROR("failed to initialise signal handlers");
+ goto error;
}
+
+ /* records the allowed count */
+ allowed = allowed_count;
+ started = 0;
+ waiting = 0;
+ remains = waiter_count;
+
+ /* start at least one thread */
+ launched = 0;
+ while ((launched + 1) < start_count) {
+ if (start_one_thread() != 0) {
+ ERROR("Not all threads can be started");
+ goto error;
+ }
+ launched++;
+ }
+
+ /* queue the start job */
+ job = job_create(NULL, 0, (job_cb_t)start, NULL);
+ if (!job) {
+ ERROR("out of memory");
+ errno = ENOMEM;
+ goto error;
+ }
+ job_add(job);
+ remains--;
+
+ /* run until end */
+ thread_run(&me);
+ rc = 0;
+error:
pthread_mutex_unlock(&mutex);
- return -!job;
+ return rc;
}
-int jobs_add_me()
+/**
+ * Terminate all the threads and cancel all pending jobs.
+ */
+void jobs_terminate()
{
- pthread_t me;
+ struct job *job, *head, *tail;
+ pthread_t me, *others;
struct thread *t;
+ int count;
/* how am i? */
me = pthread_self();
/* request all threads to stop */
pthread_mutex_lock(&mutex);
+ allowed = 0;
+
+ /* count the number of threads */
+ count = 0;
t = threads;
while (t) {
- if (pthread_equal(t->tid, me)) {
- pthread_mutex_unlock(&mutex);
- ERROR("thread already running");
- errno = EINVAL;
- return -1;
- }
+ if (!t->upper && !pthread_equal(t->tid, me))
+ count++;
t = t->next;
}
- /* allowed... */
- allowed++;
- pthread_mutex_unlock(&mutex);
+ /* fill the array of threads */
+ others = alloca(count * sizeof *others);
+ count = 0;
+ t = threads;
+ while (t) {
+ if (!t->upper && !pthread_equal(t->tid, me))
+ others[count++] = t->tid;
+ t = t->next;
+ }
- /* run */
- thread_main_loop(NULL);
+ /* stops the threads */
+ t = threads;
+ while (t) {
+ t->stop = 1;
+ t = t->next;
+ }
- /* returns */
+ /* wait the threads */
+ pthread_cond_broadcast(&cond);
+ pthread_mutex_unlock(&mutex);
+ while (count)
+ pthread_join(others[--count], NULL);
pthread_mutex_lock(&mutex);
- allowed--;
+
+ /* cancel pending jobs of other threads */
+ remains = 0;
+ 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_thread;
+ 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);
- return 0;
}
-
Code Review / src / app-framework-binder.git / blobdiff