O nás     Inzerce     KontaktSpolehlivé informace o IT již od roku 2011
Hledat
Nepřehlédněte: 2. kolo: Pozoruhodné IT produkty 2020
Správa dokumentů
Digitální transformace
Informační systémy
Hlavní rubriky: Informační systémy, Mobilní technologie, Datová centra, Sítě, IT bezpečnost, Software, Hardware, Zkušenosti a názory, Speciály

Pozoruhodné IT produkty 2020
E-knihy o IT zdarma
Odborné IT konference BusinessIT
Manuál Linux
[Linux manuál]

pthread_spin_lock, pthread_spin_trylock: uzamčení objektu zamykání rotace

Originální popis anglicky: pthread_spin_lock, pthread_spin_trylock - lock a spin lock object ( ADVANCED REALTIME THREADS)

Návod, kniha: POSIX Programmer's Manual

STRUČNĚ

#include <pthread.h>
 
 
int pthread_spin_lock(pthread_spinlock_t * lock);
 
int pthread_spin_trylock(pthread_spinlock_t * lock);
 

POPIS / INSTRUKCE

The pthread_spin_lock() function shall lock the spin lock referenced by lock. The calling thread shall acquire the lock if it is not held by another thread. Otherwise, the thread shall spin (that is, shall not return from the pthread_spin_lock() call) until the lock becomes available. The results are undefined if the calling thread holds the lock at the time the call is made. The pthread_spin_trylock() function shall lock the spin lock referenced by lock if it is not held by any thread. Otherwise, the function shall fail.
The results are undefined if any of these functions is called with an uninitialized spin lock.

NÁVRATOVÁ HODNOTA

Upon successful completion, these functions shall return zero; otherwise, an error number shall be returned to indicate the error.

CHYBY / ERRORY

These functions may fail if:
EINVAL
The value specified by lock does not refer to an initialized spin lock object.
 
The pthread_spin_lock() function may fail if:
EDEADLK
The calling thread already holds the lock.
 
The pthread_spin_trylock() function shall fail if:
EBUSY
A thread currently holds the lock.
 
These functions shall not return an error code of [EINTR].
The following sections are informative.

PŘÍKLADY POUŽITÍ

None.

APPLICATION USAGE

Applications using this function may be subject to priority inversion, as discussed in the Base Definitions volume of IEEE Std 1003.1-2001, Section 3.285, Priority Inversion.
The pthread_spin_lock() and pthread_spin_trylock() functions are part of the Spin Locks option and need not be provided on all implementations.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SOUVISEJÍCÍ

pthread_spin_destroy() , pthread_spin_unlock() , the Base Definitions volume of IEEE Std 1003.1-2001, <pthread.h> Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .
2003 IEEE/The Open Group
©2011-2020 BusinessIT.cz, ISSN 1805-0522 | Názvy použité v textech mohou být ochrannými známkami příslušných vlastníků.
Provozovatel: Bispiral, s.r.o., kontakt: BusinessIT(at)Bispiral.com | Inzerce: Best Online Media, s.r.o., zuzana@online-media.cz
O vydavateli | Pravidla webu BusinessIT.cz a ochrana soukromí | pg(7984)