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 sched_get_p(2) -- real-time scheduling operations
    Summary sched_get_priority_max() Get maximum scheduling policy sched_get_priority_min() Get minimum scheduling policy sched_getparam() Get scheduling parameters of process sched_getscheduler() Get scheduling policy of process sched_rr_get_interval() Get execution time limit for a process sched_setparam() Set scheduling parameters of process sched_setscheduler() Set scheduling policy and parameters...
 sched_rr_ge(2) -- real-time scheduling operations
    Summary sched_get_priority_max() Get maximum scheduling policy sched_get_priority_min() Get minimum scheduling policy sched_getparam() Get scheduling parameters of process sched_getscheduler() Get scheduling policy of process sched_rr_get_interval() Get execution time limit for a process sched_setparam() Set scheduling parameters of process sched_setscheduler() Set scheduling policy and parameters...
 sched_setpa(2) -- real-time scheduling operations
    Summary sched_get_priority_max() Get maximum scheduling policy sched_get_priority_min() Get minimum scheduling policy sched_getparam() Get scheduling parameters of process sched_getscheduler() Get scheduling policy of process sched_rr_get_interval() Get execution time limit for a process sched_setparam() Set scheduling parameters of process sched_setscheduler() Set scheduling policy and parameters...
 sched_setsc(2) -- real-time scheduling operations
    Summary sched_get_priority_max() Get maximum scheduling policy sched_get_priority_min() Get minimum scheduling policy sched_getparam() Get scheduling parameters of process sched_getscheduler() Get scheduling policy of process sched_rr_get_interval() Get execution time limit for a process sched_setparam() Set scheduling parameters of process sched_setscheduler() Set scheduling policy and parameters...
 sched_yield(2) -- real-time scheduling operations
    Summary sched_get_priority_max() Get maximum scheduling policy sched_get_priority_min() Get minimum scheduling policy sched_getparam() Get scheduling parameters of process sched_getscheduler() Get scheduling policy of process sched_rr_get_interval() Get execution time limit for a process sched_setparam() Set scheduling parameters of process sched_setscheduler() Set scheduling policy and parameters...
 select(2) -- synchronous I/O multiplexing
    The select() function indicates which of the specified file descriptors is ready for reading, ready for writing, or has an error condition pending. If the specified condition is false for all of the specified file descriptors, select() blocks, up to the specified timeout interval, until the specified condition is true for at least one of the specified file descriptors. The select() function suppor...
 semctl(2) -- semaphore control operations
    The semctl() system call provides a variety of semaphore control operations as specified by cmd. The fourth argument is optional and depends on the operation requested. If present, it must be of type union semun, which the application program must explicitly declare. For the meaning of unspecified variables, see semaphore identifier in glossary(9). The following values for cmd are executed with re...
 semget(2) -- get set of semaphores
    semget() returns the semaphore identifier associated with key. A semaphore identifier and associated data structure and set containing nsems semaphores are created for key if one of the following is true: key is equal to IPC_PRIVATE. This call creates a new identifier, subject to available resources. The identifier is never returned by another call to semget() until it has been released by a call ...
 semop(2) -- semaphore operations
    semop() is used to atomically perform an array of semaphore operations on the set of semaphores associated with the semaphore identifier specified by semid. sops is a pointer to the array of semaphoreoperation structures. nsops is the number of such structures in the array. The contents of each structure includes the following members: ushort sem_num; /* semaphore number */ short sem_op /* semapho...
 semtimedop(2) -- semaphore operations
    semop() is used to atomically perform an array of semaphore operations on the set of semaphores associated with the semaphore identifier specified by semid. sops is a pointer to the array of semaphoreoperation structures. nsops is the number of such structures in the array. The contents of each structure includes the following members: ushort sem_num; /* semaphore number */ short sem_op /* semapho...
 sem_close(2) -- close a named POSIX semaphore
    sem_close() is used to close a named semaphore. A successful call to sem_close() will do the following: Remove the process's descriptor for the semaphore referenced by the specified sem_t structure sem. Remove the semaphore referenced by the specified sem_t structure sem, if the semaphore is marked for removal by a call to sem_unlink() and there are no other descriptors referencing this semaphore...
 sem_destroy(2) -- destroy an unnamed POSIX semaphore
    sem_destroy() is used to destroy an unnamed semaphore. A successful call to sem_destroy() will invalidate the unnamed semaphore referred to by sem and removes all descriptors referencing it. The semaphore should have been created by a previous call to sem_init() and there should not be any processes blocked on it. To use this function, link in the realtime library by specifying -lrt on the compile...
 sem_getvalue(2) -- get the value of a POSIX semaphore
    sem_getvalue() is used to read the value of the semaphore. The value of the semaphore specified by sem is read, at some unspecified time during the call, and then stored into sval. If the semaphore value is <= 0, at that time, the semaphore is considered unavailable. If the semaphore value is > 0, at that time, the semaphore is considered available. If sval is positive, it is equal to the number o...
 sem_init(2) -- initialize an unnamed POSIX semaphore
    sem_init() is used to initialize an unnamed semaphore. A successful call to sem_init() will create a new unnamed semaphore referred to by sem, if one does not exist, initialize the unnamed semaphore descriptor, referred to by sem, to the non-negative value specified by value. If the unnamed semaphore already exists, i.e. created by a previous call to sem_init(), it is re-initialized only if its cu...
 sem_open(2) -- create/open a named POSIX semaphore
    sem_open() is used to open or create a named semaphore. A successful call to sem_open() will create a descriptor for the semaphore specified by name. The pointer to the semaphore returned by sem_open() can be used to access the semaphore associated with name in subsequent operations. The name argument points to a string referring to a semaphore. It should begin with a "/" and shall conform to pa...
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