120 lines
3.8 KiB
C++
120 lines
3.8 KiB
C++
#include "Mutex.h"
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#include "../../serviceinterface/ServiceInterfaceStream.h"
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#include "../../timemanager/Clock.h"
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uint8_t Mutex::count = 0;
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#include <cstring>
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#include <errno.h>
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Mutex::Mutex() {
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pthread_mutexattr_t mutexAttr;
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int status = pthread_mutexattr_init(&mutexAttr);
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if (status != 0) {
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#if CPP_OSTREAM_ENABLED == 1
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sif::error << "Mutex: Attribute init failed with: " << strerror(status) << std::endl;
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#endif
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}
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status = pthread_mutexattr_setprotocol(&mutexAttr, PTHREAD_PRIO_INHERIT);
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if (status != 0) {
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#if CPP_OSTREAM_ENABLED == 1
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sif::error << "Mutex: Attribute set PRIO_INHERIT failed with: " << strerror(status)
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<< std::endl;
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#endif
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}
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status = pthread_mutex_init(&mutex, &mutexAttr);
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if (status != 0) {
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#if CPP_OSTREAM_ENABLED == 1
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sif::error << "Mutex: creation with name, id " << mutex.__data.__count
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<< ", " << " failed with " << strerror(status) << std::endl;
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#endif
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}
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// After a mutex attributes object has been used to initialize one or more
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// mutexes, any function affecting the attributes object
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// (including destruction) shall not affect any previously initialized mutexes.
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status = pthread_mutexattr_destroy(&mutexAttr);
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if (status != 0) {
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#if CPP_OSTREAM_ENABLED == 1
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sif::error << "Mutex: Attribute destroy failed with " << strerror(status) << std::endl;
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#endif
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}
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}
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Mutex::~Mutex() {
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//No Status check yet
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pthread_mutex_destroy(&mutex);
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}
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ReturnValue_t Mutex::lockMutex(TimeoutType timeoutType, uint32_t timeoutMs) {
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int status = 0;
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if(timeoutType == TimeoutType::POLLING) {
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status = pthread_mutex_trylock(&mutex);
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}
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else if (timeoutType == TimeoutType::WAITING) {
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timespec timeOut;
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clock_gettime(CLOCK_REALTIME, &timeOut);
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uint64_t nseconds = timeOut.tv_sec * 1000000000 + timeOut.tv_nsec;
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nseconds += timeoutMs * 1000000;
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timeOut.tv_sec = nseconds / 1000000000;
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timeOut.tv_nsec = nseconds - timeOut.tv_sec * 1000000000;
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status = pthread_mutex_timedlock(&mutex, &timeOut);
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}
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else if(timeoutType == TimeoutType::BLOCKING) {
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status = pthread_mutex_lock(&mutex);
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}
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switch (status) {
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case EINVAL:
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// The mutex was created with the protocol attribute having the value
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// PTHREAD_PRIO_PROTECT and the calling thread's priority is higher
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// than the mutex's current priority ceiling.
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return WRONG_ATTRIBUTE_SETTING;
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// The process or thread would have blocked, and the abs_timeout
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// parameter specified a nanoseconds field value less than zero or
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// greater than or equal to 1000 million.
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// The value specified by mutex does not refer to an initialized mutex object.
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//return MUTEX_NOT_FOUND;
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case EBUSY:
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// The mutex could not be acquired because it was already locked.
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return MUTEX_ALREADY_LOCKED;
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case ETIMEDOUT:
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// The mutex could not be locked before the specified timeout expired.
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return MUTEX_TIMEOUT;
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case EAGAIN:
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// The mutex could not be acquired because the maximum number of
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// recursive locks for mutex has been exceeded.
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return MUTEX_MAX_LOCKS;
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case EDEADLK:
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// A deadlock condition was detected or the current thread
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// already owns the mutex.
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return CURR_THREAD_ALREADY_OWNS_MUTEX;
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case 0:
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//Success
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return HasReturnvaluesIF::RETURN_OK;
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default:
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return HasReturnvaluesIF::RETURN_FAILED;
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};
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}
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ReturnValue_t Mutex::unlockMutex() {
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int status = pthread_mutex_unlock(&mutex);
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switch (status) {
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case EINVAL:
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//The value specified by mutex does not refer to an initialized mutex object.
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return MUTEX_NOT_FOUND;
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case EAGAIN:
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//The mutex could not be acquired because the maximum number of recursive locks for mutex has been exceeded.
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return MUTEX_MAX_LOCKS;
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case EPERM:
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//The current thread does not own the mutex.
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return CURR_THREAD_DOES_NOT_OWN_MUTEX;
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case 0:
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//Success
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return HasReturnvaluesIF::RETURN_OK;
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default:
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return HasReturnvaluesIF::RETURN_FAILED;
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};
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}
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