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Copy pathqueue_signalled.cpp
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312 lines (259 loc) · 7.44 KB
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/* Wrapper around queue that uses POSIX CV's for signalling writes.
*
* Author: Georg Martin Reinke <georg.reinke@rwth-aachen.de>
* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
* SPDX-License-Identifier: Apache-2.0
*/
#include <villas/node/config.hpp>
#include <villas/queue_signalled.h>
#ifdef HAS_EVENTFD
#include <sys/eventfd.h>
#endif
using namespace villas::node;
static void queue_signalled_cleanup(void *p) {
struct CQueueSignalled *qs = (struct CQueueSignalled *)p;
if (qs->mode == QueueSignalledMode::PTHREAD)
pthread_mutex_unlock(&qs->pthread.mutex);
}
int villas::node::queue_signalled_init(struct CQueueSignalled *qs, size_t size,
struct memory::Type *mem,
enum QueueSignalledMode mode,
int flags) {
int ret;
qs->mode = mode;
if (qs->mode == QueueSignalledMode::AUTO) {
#ifdef __linux__
if (flags & (int)QueueSignalledFlags::PROCESS_SHARED)
qs->mode = QueueSignalledMode::PTHREAD;
else {
#ifdef HAS_EVENTFD
qs->mode = QueueSignalledMode::EVENTFD;
#else
qs->mode = QueueSignalledMode::PTHREAD;
#endif
}
#else
qs->mode = QueueSignalledMode::PTHREAD;
#endif
}
ret = queue_init(&qs->queue, size, mem);
if (ret < 0)
return ret;
if (qs->mode == QueueSignalledMode::PTHREAD) {
pthread_condattr_t cvattr;
pthread_mutexattr_t mtattr;
ret = pthread_mutexattr_init(&mtattr);
if (ret)
return ret;
ret = pthread_condattr_init(&cvattr);
if (ret)
return ret;
if (flags & (int)QueueSignalledFlags::PROCESS_SHARED) {
ret = pthread_mutexattr_setpshared(&mtattr, PTHREAD_PROCESS_SHARED);
if (ret)
return ret;
ret = pthread_condattr_setpshared(&cvattr, PTHREAD_PROCESS_SHARED);
if (ret)
return ret;
}
ret = pthread_mutex_init(&qs->pthread.mutex, &mtattr);
if (ret)
return ret;
ret = pthread_cond_init(&qs->pthread.ready, &cvattr);
if (ret)
return ret;
ret = pthread_mutexattr_destroy(&mtattr);
if (ret)
return ret;
ret = pthread_condattr_destroy(&cvattr);
if (ret)
return ret;
} else if (qs->mode == QueueSignalledMode::POLLING) {
/* Nothing todo */
}
#ifdef HAS_EVENTFD
else if (qs->mode == QueueSignalledMode::EVENTFD) {
qs->eventfd = eventfd(0, 0);
if (qs->eventfd < 0)
return -2;
}
#endif
else
return -1;
return 0;
}
int villas::node::queue_signalled_destroy(struct CQueueSignalled *qs) {
int ret;
ret = queue_destroy(&qs->queue);
if (ret < 0)
return ret;
if (qs->mode == QueueSignalledMode::PTHREAD) {
pthread_cond_destroy(&qs->pthread.ready);
pthread_mutex_destroy(&qs->pthread.mutex);
} else if (qs->mode == QueueSignalledMode::POLLING) {
// Nothing todo
}
#ifdef HAS_EVENTFD
else if (qs->mode == QueueSignalledMode::EVENTFD) {
ret = close(qs->eventfd);
if (ret)
return ret;
}
#endif
else
return -1;
return 0;
}
int villas::node::queue_signalled_push(struct CQueueSignalled *qs, void *ptr) {
int pushed;
pushed = queue_push(&qs->queue, ptr);
if (pushed <= 0)
return pushed;
if (qs->mode == QueueSignalledMode::PTHREAD) {
pthread_mutex_lock(&qs->pthread.mutex);
pthread_cond_broadcast(&qs->pthread.ready);
pthread_mutex_unlock(&qs->pthread.mutex);
} else if (qs->mode == QueueSignalledMode::POLLING) {
// Nothing todo
}
#ifdef HAS_EVENTFD
else if (qs->mode == QueueSignalledMode::EVENTFD) {
int ret;
uint64_t incr = 1;
ret = write(qs->eventfd, &incr, sizeof(incr));
if (ret < 0)
return ret;
}
#endif
else
return -1;
return pushed;
}
int villas::node::queue_signalled_push_many(struct CQueueSignalled *qs,
void *ptr[], size_t cnt) {
int pushed;
pushed = queue_push_many(&qs->queue, ptr, cnt);
if (pushed <= 0)
return pushed;
if (qs->mode == QueueSignalledMode::PTHREAD) {
pthread_mutex_lock(&qs->pthread.mutex);
pthread_cond_broadcast(&qs->pthread.ready);
pthread_mutex_unlock(&qs->pthread.mutex);
} else if (qs->mode == QueueSignalledMode::POLLING) {
// Nothing todo
}
#ifdef HAS_EVENTFD
else if (qs->mode == QueueSignalledMode::EVENTFD) {
int ret;
uint64_t incr = 1;
ret = write(qs->eventfd, &incr, sizeof(incr));
if (ret < 0)
return ret;
}
#endif
else
return -1;
return pushed;
}
int villas::node::queue_signalled_pull(struct CQueueSignalled *qs, void **ptr) {
int pulled = 0;
// Make sure that qs->mutex is unlocked if this thread gets cancelled
pthread_cleanup_push(queue_signalled_cleanup, qs);
if (qs->mode == QueueSignalledMode::PTHREAD)
pthread_mutex_lock(&qs->pthread.mutex);
while (!pulled) {
pulled = queue_pull(&qs->queue, ptr);
if (pulled < 0)
break;
else if (pulled == 0) {
if (qs->mode == QueueSignalledMode::PTHREAD)
pthread_cond_wait(&qs->pthread.ready, &qs->pthread.mutex);
else if (qs->mode == QueueSignalledMode::POLLING)
continue; // Try again
#ifdef HAS_EVENTFD
else if (qs->mode == QueueSignalledMode::EVENTFD) {
int ret;
uint64_t cntr;
ret = read(qs->eventfd, &cntr, sizeof(cntr));
if (ret < 0)
break;
}
#endif
else
break;
}
}
if (qs->mode == QueueSignalledMode::PTHREAD)
pthread_mutex_unlock(&qs->pthread.mutex);
pthread_cleanup_pop(0);
return pulled;
}
int villas::node::queue_signalled_pull_many(struct CQueueSignalled *qs,
void *ptr[], size_t cnt) {
int pulled = 0;
// Make sure that qs->mutex is unlocked if this thread gets cancelled
pthread_cleanup_push(queue_signalled_cleanup, qs);
if (qs->mode == QueueSignalledMode::PTHREAD)
pthread_mutex_lock(&qs->pthread.mutex);
while (!pulled) {
pulled = queue_pull_many(&qs->queue, ptr, cnt);
if (pulled < 0)
break;
else if (pulled == 0) {
if (qs->mode == QueueSignalledMode::PTHREAD)
pthread_cond_wait(&qs->pthread.ready, &qs->pthread.mutex);
else if (qs->mode == QueueSignalledMode::POLLING)
continue; // Try again
#ifdef HAS_EVENTFD
else if (qs->mode == QueueSignalledMode::EVENTFD) {
int ret;
uint64_t cntr;
ret = read(qs->eventfd, &cntr, sizeof(cntr));
if (ret < 0)
break;
}
#endif
else
break;
}
}
if (qs->mode == QueueSignalledMode::PTHREAD)
pthread_mutex_unlock(&qs->pthread.mutex);
pthread_cleanup_pop(0);
return pulled;
}
int villas::node::queue_signalled_close(struct CQueueSignalled *qs) {
int ret;
if (qs->mode == QueueSignalledMode::PTHREAD)
pthread_mutex_lock(&qs->pthread.mutex);
ret = queue_close(&qs->queue);
if (qs->mode == QueueSignalledMode::PTHREAD) {
pthread_cond_broadcast(&qs->pthread.ready);
pthread_mutex_unlock(&qs->pthread.mutex);
} else if (qs->mode == QueueSignalledMode::POLLING) {
// Nothing todo
}
#ifdef HAS_EVENTFD
else if (qs->mode == QueueSignalledMode::EVENTFD) {
int ret;
uint64_t incr = 1;
ret = write(qs->eventfd, &incr, sizeof(incr));
if (ret < 0)
return ret;
}
#endif
else
return -1;
return ret;
}
int villas::node::queue_signalled_fd(struct CQueueSignalled *qs) {
switch (qs->mode) {
#ifdef HAS_EVENTFD
case QueueSignalledMode::EVENTFD:
return qs->eventfd;
#endif
default: {
}
}
return -1;
}