guia ref posix

Guı́a de Referencia Rápida de POSIX de Tiempo Real
PThreads–Hebras
Lı́mites
Fichero de Configuración: /etc/security/limits.conf
#include <pthread.h>
pthread_attr_init(&attr)
pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED)
pthread_attr_getinheritsched(&attr, &mode)
pthread_attr_setschedpolicy(&attr, policy)
pthread_attr_getschedpolicy(&attr, &policy)
pthread_attr_setschedparam(&attr, &param)
pthread_attr_getschedparam(&attr, &param)
pthread_attr_setdetachstate(&attr, state)
pthread_attr_getdetachstate(&attr, &state)
pthread_attr_setstacksize(&attr, stacksize)
pthread_attr_getstacksize(&attr, &stacksize)
pthread_attr_destroy(&attr)
alumno - memlock 51200
alumno - rtprio 50
#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>
getrlimit(resource, &rlim)
setrlimit(resource, &rlim)
// resource: RLIMIT_MEMLOCK, RLIMIT_RTPRIO
Memoria Virtual
#include <sys/mman.h>
mlockall(flags)
// flags: MCL_CURRENT | MCL_FUTURE
pthread_t pthread_self()
pthread_create(&thread_id, &attr, proc, arg)
pthread_cancel(thread_id)
pthread_join(thread_id, &ptr_retval)
pthread_setschedparam(thread_id, policy, &param)
pthread_getschedparam(thread_id, &policy, &param)
pthread_exit(ptr_retval)
// policy: SCHED_FIFO, SCHED_RR, SCHED_OTHER
// param.sched_priority = priority;
Relojes de Tiempo Real
#include <time.h>
clock_gettime(clk_id, &ts)
clock_nanosleep(clk_id, flags, &ts, &remain)
// clk_id: CLOCK_MONOTONIC, flags: TIMER_ABSTIME
Señales
#include <signal.h>
sigemptyset(&sigset)
sigaddset(&sigset, signum)
sigprocmask(mode, &sigset, &oldset)
sigwait(&sigset, &signum)
sigwaitinfo(&sigset, &siginfo)
sigqueue(pid, signum, value)
sigaction(signum, &sigact, &oldact)
PThreads–Exclusión Mutua
#include <unistd.h>
#define __USE_UNIX98
#include <pthread.h>
pthread_mutexattr_init(&attr)
pthread_mutexattr_setprotocol(&attr, protocol)
pthread_mutexattr_getprotocol(&attr, &protocol)
pthread_mutexattr_setprioceiling(&attr, prioceiling)
pthread_mutexattr_getprioceiling(&attr, &prioceiling)
pthread_mutexattr_destroy(&attr)
// protocol: PTHREAD_PRIO_INHERIT, PTHREAD_PRIO_PROTECT
#include <pthread.h>
pthread_sigmask(mode, &sigset, &oldset)
pthread_kill(thread_id, signum)
// mode: SIG_BLOCK, SIG_UNBLOCK
pthread_mutex_init(&mutex, &attr)
pthread_mutex_lock(&mutex)
pthread_mutex_trylock(&mutex)
pthread_mutex_unlock(&mutex)
pthread_mutex_destroy(&mutex)
Timers
#include <signal.h>
#include <time.h>
timer_create(clk_id, &sgev, &timer_id)
timer_settime(timer_id, flags, &its, &oldits)
timer_gettime(timer_id, &its)
timer_delete(timer_id)
// clk_id: CLOCK_MONOTONIC, flags: 0
// sgev.sigev_notify = SIGEV_SIGNAL;
// sgev.sigev_signo = signum;
PThreads–Variables de Condición
#include <pthread.h>
pthread_condattr_init(&attr)
pthread_condattr_destroy(&attr)
pthread_cond_init(&cond, &attr)
pthread_cond_wait(&cond, &mutex)
pthread_cond_timedwait(&cond, &mutex, &abstimeout)
pthread_cond_signal(&cond)
pthread_cond_broadcast(&cond)
pthread_cond_destroy(&cond)
Planificación de Procesos
#include <sys/types.h>
#include <unistd.h>
pid_t getpid()
PThreads–Semáforos
#include <sched.h>
sched_setparam(pid, &param)
sched_getparam(pid, &param)
sched_setscheduler(pid, policy, &param)
sched_getscheduler(pid)
// policy: SCHED_FIFO, SCHED_RR, SCHED_OTHER
#include <semaphore.h>
sem_init(&sem, pshared, val)
sem_post(&sem)
sem_wait(&sem)
sem_trywait(&sem)
sem_timedwait(&sem, &abstimeout)
Compilación y Enlazado
sem_getvalue(&sem, &val)
gcc -Wall -Wextra -Werror -pthread -o main main.c -lpthreadsem_destroy(&sem)
-lrt
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