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1998-03-11 00:42 Wolfram Gloger <wmglo@dent.med.uni-muenchen.de> * linuxthreads/manager.c: Enable resetting of the thread scheduling policy to SCHED_OTHER when the parent thread has a different one. 1998-02-01 13:51 Ulrich Drepper <drepper@cygnus.com> * sysdeps/unix/sysv/linux/bits/posix_opt.h: Define _POSIX_ASYNCHRONOUS_IO. * sysdeps/pthread/pthread.h: Define bits for Unix98 variants of mutexes. * mutex.c: Implement new mutex types. * internals.h: Include <signal.h>. * libpthread.map: Add __erno_location and __h_errno_location. * errno.c: Return pointer to variable actually in use. This might not be the one in the thread structure. * internals.h (struct _pthread_descr_struct): Add new fields p_errnop and p_h_errnop. * manager.c (__pthread_manager): Set p_errnop and p_h_errnop member of manager thread structure. (pthread_handle_create): Set p_errnop and p_h_errnop members for new thread. * pthread.c: Adapt initializer for thread structures. (__pthread_initial_thread): Set p_errnop and p_h_errnop member. (__pthread_reset_main_thread): Reset p_errnop and p_h_errnop of current thread to global variables. 1998-01-31 17:27 Ulrich Drepper <drepper@cygnus.com> * rwlock.c: New file. * Makefile (libpthread-routines): Add rwlock. * sysdeps/pthread/pthread.h: Define data structures and declare functions. * libpthread.map: Add new functions. 1997-12-18 13:50 Philip Blundell <pb@nexus.co.uk> * sysdeps/arm/pt-machine.h: New file; add ARM support. * sysdeps/arm/Implies: likewise. * README: Document it. 1997-12-13 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * signals.c: Remove unneeded initializer for sigwaited, saving a 1997-04-11 01:18 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * semaphore.c (sem_init): Set sem_spinlock only if available. 1997-12-04 01:48 Ulrich Drepper <drepper@cygnus.com> * mutex.c: Implement PTHREAD_MUTEX_CHECKERROR. * sysdeps/pthread/pthread.h: Define PTHREAD_MUTEX_CHECKERROR. * Makefile: Update from LinuxThreads 0.7. * internals.h. Likewise. * manager.c: Likewise. * mutex.c: Likewise. * pthread.c: Likewise. * signals.c: Likewise. * specific.c: Likewise. * Examples/ex3.c: Likewise. 1997-11-20 18:13 Ulrich Drepper <drepper@cygnus.com> * pthread.c (__pthread_reset_main_thread): Close pipe only if still open. 1997-10-29 05:38 Ulrich Drepper <drepper@cygnus.com> * wrapsyscall.c: Add socket functions which are also cancelation points. 1997-10-19 21:40 Wolfram Gloger <wg@wolfram.dent.med.uni-muenchen.de> * specific.c (__libc_internal_tsd_set, __libc_internal_tsd_get): New functions for fast thread specific data within libc. * internals.h: Add new array p_libc_specific to struct _pthread_descr_struct. * sysdeps/pthread/bits/libc-lock.h: Declare new functions. 1997-10-13 05:39 Ulrich Drepper <drepper@cygnus.com> * semaphore.h: Add __BEGIN_DECLS/__END_DECLS. Reported by Ralf Corsepius <corsepiu@faw.uni-ulm.de>. 1997-08-29 03:05 Ulrich Drepper <drepper@cygnus.com> * internals.h (struct _pthread_descr_struct): Add definitions for two-level specific key handling. * manager.c (pthread_handle_create): Initialize specific memory array. * specific.c: Implement two-level key handling. * weaks.c: Don't provide dummy key handling. * sysdeps/pthread/bits/libc-lock.h: Typedef __libc_lock_t (no #define). Add definition of __libc_key_t. * sysdeps/unix/sysv/linux/bits/local_lim.h: Define PTHREAD_KEYS_MAX as 1024. Add definition of _POSIX_THREAD_DESTRUCTOR_ITERATIONS and PTHREAD_DESTRUCTOR_ITERATIONS. * manager.c (pthread_handle_create): Compare mmap result with MAP_FAILED. * ptfork.c: Rename to __pthread_atfork and make old name a weak alias. * sysdeps/pthread/bits/pthread.h: Add prototype for __pthread_atfork. 1997-08-22 19:04 Richard Henderson <rth@cygnus.com> sysdeps/sparc -> sysdeps/sparc/sparc32 sysdeps/sparc64 -> sysdeps/sparc/sparc64 * internals.h: Change definition of THREAD_SELF to be an expression, not a statement that did a return. * sysdeps/alpha/pt-machine.h (THREAD_SELF): Update accordingly. * sysdeps/sparc/sparc32/pt-machine.h (THREAD_SELF, INIT_THREAD_SELF): Follow Solaris and use a "system reserved" register (%g6) to hold the thread descriptor. * sysdeps/sparc/sparc64/pt-machine.h: Likewise. 1997-08-03 00:09 Ulrich Drepper <drepper@cygnus.com> * mutex.c: Correct pthread_once. Patch by Xavier Leroy. * sysdeps/pthread/pthread.h: Add prototype for __pthread_once. * sysdeps/pthread/bits/pthread.h: Add macros for __libc_once. * semaphore.c: Include spinlock.h only when needed. * specific.c (__pthread_setsepcific, __pthread_getspecific): Reject keys for entries not in use. * weaks.c: Implement key handling functions for real. 1997-06-29 01:04 Richard Henderson <richard@gnu.ai.mit.edu> Initial sparc64-linux support: * linuxthreads/sysdeps/sparc64/Implies: New file. * linuxthreads/sysdeps/sparc64/pt-machine.h: Likewise. 1997-06-29 00:48 Ulrich Drepper <drepper@cygnus.com> * semaphore.c: Include spinlock.h at correct place. Patch by HJ Lu. 1997-06-13 10:06 Richard Henderson <rth@tamu.edu> The Great Bit File Move: * sysdeps/alpha/semaphorebits.h: -> .../bits/semaphore.h. * sysdeps/powerpc/semaphorebits.h: Likewise. * sysdeps/pthread/cmpxchg/semaphorebits.h: Likewise. * sysdeps/pthread/no-cmpxchg/semaphorebits.h: Likewise. * sysdeps/pthread/libc-lock.h: -> bits/ * sysdeps/pthread/stdio-lock.h: Likewise. * sysdeps/unix/sysv/linux/local_lim.h: Likewise. * sysdeps/unix/sysv/linux/posix_opt.h: Likewise. * semaphore.h: Likewise. * sysdeps/pthread/pthread.h: Likewise. * lockfile.c: <foo.h> -> <bits/foo.h>. * semaphore.h: Likewise. * Makefile: (headers): foo.h -> bits/foo.h. * sysdeps/pthread/Makefile: Likewise. 1997-04-11 01:18 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * semaphore.c (sem_init): Set sem_spinlock only if available. * sysdeps/m68k/pt-machine.h (testandset, __compare_and_swap): Fix asm constraints. 1997-04-09 03:00 Ulrich Drepper <drepper@cygnus.com> Update from LinuxThreads 0.6. * attr.c (pthread_attr_getdetachstate): Use __sched_get_priority_max and __sched_get_priority_min instead of names without `__'. * manager.c: Rewrite large parts to implement opaque pthread_t. * cancel.c: Adapt for opaque pthread_t type. * condvar.c: Likewise. * errno.c: Likewise. * join.c: Likewise. * mutex.c: Likewise. * pthread.c: Likewise. * signals.c: Likewise. * specific.c: Likewise. * restart.h: Likewise. * queue.h: Likewise. * Examples/ex3.c: Likewise. * Examples/ex4.c: Likewise. * sysdeps/pthread/pthread.h: Likewise. * pthread.c: Accumulate time for all threads in thread manager. * semaphore.c: Implement fallback implementation for architectures sometimes missing compare-exchange operations. * cancel.c (pthread_cancel): Validate handle argument. * join.c (pthread_join): Likewise. (pthread_detach): Likewise. * signals.c (pthread_kill): Likewise. * spinlock.h (acquire): Use __sched_yield not sched_yield. * queue.h (enqueue): Enqueue thread according to priority. * internals.c (struct pthread_start_args): New struct for passing args to cloning function. (struct _pthread): Rename to _pthread_descr_struct and adapt for opaque pthread_t. * Examples/Makefile (clean): Pass -f option to rm. * sysdeps/i386/pt-machine.h: Add check for compare-exchange instruction and define TEST_FOR_COMPARE_AND_SWAP. * sysdeps/i386/i486/pt-machine.h: Removed. * sysdeps/unix/sysv/linux/local_lim.h (PTHREAD_THREADS_MAX): Increase to 1024. 1997-04-04 16:38 Ulrich Drepper <drepper@cygnus.com> * restart.h (suspend): Clear p_signal before suspending. (suspend_with_cancellation): Likewise. Patch by Xavier Leroy <Xavier.Leroy@inria.fr>. * weaks.c: Make __pthread_key_create return 1. * sysdeps/pthread/libc-lock.h: Define __libc_key_create, __libc_getspecific, __libc_setspecific, and __libc_key_t. * sysdeps/pthread/stdio-lock.h: Don't care for implementation not using libio. 1997-03-19 15:13 Miguel de Icaza <miguel@nuclecu.unam.mx> * sysdeps/sparc/pt-machine (RELEASE): Fix. 1997-03-01 07:55 Geoff Keating <geoffk@ozemail.com.au> * sysdeps/powerpc/Implies: Added. * sysdeps/powerpc/pt-machine.h: Added. * sysdeps/powerpc/semaphorebits.h: Added. 1997-01-22 01:22 Ulrich Drepper <drepper@cygnus.com> * linuxtheads/pthread.c (__pthread_initial_thread): Correct initializer. (__pthread_manager_thread): Likewise. Reported by Andreas Jaeger. 1997-01-18 22:15 Richard Henderson <rth@tamu.edu> Since sigset_t no longer fits in a register, we can't pass in the thread's initial mask so easily. Take this opportunity to simplify the clone implementation by only accepting a single void* argument. * linuxthreads/manager.c (__pthread_manager): Put thread vitals in the thread struct instead of as arguments through clone. (pthread_start_thread): Look for them there. * linuxthreads/internals.h (struct _pthread): Add p_initial_fn, p_initial_fn_arg, p_initial_mask. Fix __pthread_manager proto. * linuxthreads/pthread.c (pthread_initialize_manager): Revise clone invocation.
222 lines
7.2 KiB
Groff
222 lines
7.2 KiB
Groff
.TH PTHREAD_ATTR_INIT 3 LinuxThreads
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.XREF pthread_attr_destroy
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.XREF pthread_attr_setdetachstate
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.XREF pthread_attr_getdetachstate
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.XREF pthread_attr_setschedparam
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.XREF pthread_attr_getschedparam
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.XREF pthread_attr_setschedpolicy
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.XREF pthread_attr_getschedpolicy
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.XREF pthread_attr_setinheritsched
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.XREF pthread_attr_getinheritsched
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.XREF pthread_attr_setscope
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.XREF pthread_attr_getscope
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.SH NAME
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pthread_attr_init, pthread_attr_destroy, pthread_attr_setdetachstate, pthread_attr_getdetachstate, pthread_attr_setschedparam, pthread_attr_getschedparam, pthread_attr_setschedpolicy, pthread_attr_getschedpolicy, pthread_attr_setinheritsched, pthread_attr_getinheritsched, pthread_attr_setscope, pthread_attr_getscope \- thread creation attributes
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.SH SYNOPSIS
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#include <pthread.h>
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int pthread_attr_init(pthread_attr_t *attr);
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int pthread_attr_destroy(pthread_attr_t *attr);
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int pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate);
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int pthread_attr_getdetachstate(const pthread_attr_t *attr, int *detachstate);
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int pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy);
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int pthread_attr_getschedpolicy(const pthread_attr_t *attr, int *policy);
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int pthread_attr_setschedparam(pthread_attr_t *attr, const struct sched_param *param);
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int pthread_attr_getschedparam(const pthread_attr_t *attr, struct sched_param *param);
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int pthread_attr_setinheritsched(pthread_attr_t *attr, int inherit);
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int pthread_attr_getinheritsched(const pthread_attr_t *attr, int *inherit);
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int pthread_attr_setscope(pthread_attr_t *attr, int scope);
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int pthread_attr_getscope(const pthread_attr_t *attr, int *scope);
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.SH DESCRIPTION
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Setting attributes for threads is achieved by filling a
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thread attribute object |attr| of type !pthread_attr_t!, then passing it as
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second argument to !pthread_create!(3). Passing !NULL! is equivalent to
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passing a thread attribute object with all attributes set to their
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default values.
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!pthread_attr_init! initializes the thread attribute object |attr| and
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fills it with default values for the attributes. (The default values
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are listed below for each attribute.)
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Each attribute |attrname| (see below for a list of all attributes) can
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be individually set using the function !pthread_attr_set!|attrname|
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and retrieved using the function !pthread_attr_get!|attrname|.
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!pthread_attr_destroy! destroys a thread attribute object, which
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must not be reused until it is reinitialized. !pthread_attr_destroy!
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does nothing in the LinuxThreads implementation.
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Attribute objects are consulted only when creating a new thread. The
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same attribute object can be used for creating several
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threads. Modifying an attribute object after a call to
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!pthread_create! does not change the attributes of the thread
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previously created.
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The following thread attributes are supported:
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.SS detachstate
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Control whether the thread is created in the joinable state (value
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!PTHREAD_CREATE_JOINABLE!) or in the detached state
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(!PTHREAD_CREATE_DETACHED!).
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Default value: !PTHREAD_CREATE_JOINABLE!.
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In the joinable state, another thread can synchronize on the thread
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termination and recover its termination code using !pthread_join!(3),
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but some of the thread resources are kept allocated after the thread
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terminates, and reclaimed only when another thread performs
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!pthread_join!(3) on that thread.
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In the detached state, the thread resources are immediately freed when
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it terminates, but !pthread_join!(3) cannot be used to synchronize on
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the thread termination.
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A thread created in the joinable state can later be put in the
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detached thread using !pthread_detach!(3).
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.SS schedpolicy
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Select the scheduling policy for the thread: one of
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!SCHED_OTHER! (regular, non-realtime scheduling),
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!SCHED_RR! (realtime, round-robin) or
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!SCHED_FIFO! (realtime, first-in first-out). See
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!sched_setpolicy!(2) for more information on scheduling policies.
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Default value: !SCHED_OTHER!.
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The realtime scheduling policies !SCHED_RR! and !SCHED_FIFO! are
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available only to processes with superuser privileges.
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The scheduling policy of a thread can be changed after creation with
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!pthread_setschedparam!(3).
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.SS schedparam
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Contain the scheduling parameters (essentially, the scheduling
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priority) for the thread. See !sched_setparam!(2) for more information
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on scheduling parameters.
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Default value: priority is 0.
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This attribute is not significant if the scheduling policy is !SCHED_OTHER!;
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it only matters for the realtime policies !SCHED_RR! and !SCHED_FIFO!.
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The scheduling priority of a thread can be changed after creation with
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!pthread_setschedparam!(3).
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.SS inheritsched
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Indicate whether the scheduling policy and scheduling parameters for
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the newly created thread are determined by the values of the
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|schedpolicy| and |schedparam| attributes (value
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!PTHREAD_EXPLICIT_SCHED!) or are inherited from the parent thread
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(value !PTHREAD_INHERIT_SCHED!).
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Default value: !PTHREAD_EXPLICIT_SCHED!.
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.SS scope
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Define the scheduling contention scope for the created thread. The
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only value supported in the LinuxThreads implementation is
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!PTHREAD_SCOPE_SYSTEM!, meaning that the threads contend for CPU time
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with all processes running on the machine. In particular, thread
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priorities are interpreted relative to the priorities of all other
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processes on the machine. The other value specified by the standard,
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!PTHREAD_SCOPE_PROCESS!, means that scheduling contention occurs only
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between the threads of the running process: thread priorities are
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interpreted relative to the priorities of the other threads of the
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process, regardless of the priorities of other processes.
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!PTHREAD_SCOPE_PROCESS! is not supported in LinuxThreads.
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Default value: !PTHREAD_SCOPE_SYSTEM!.
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.SH "RETURN VALUE"
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All functions return 0 on success and a non-zero error code on error.
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On success, the !pthread_attr_get!|attrname| functions also store the
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current value of the attribute |attrname| in the location pointed to
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by their second argument.
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.SH ERRORS
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The !pthread_attr_setdetachstate! function returns the following error
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codes on error:
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.RS
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.TP
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!EINVAL!
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the specified |detachstate| is not one of !PTHREAD_CREATE_JOINABLE! or
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!PTHREAD_CREATE_DETACHED!.
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.RE
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The !pthread_attr_setschedparam! function returns the following error
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codes on error:
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.RS
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.TP
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!EINVAL!
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the priority specified in |param| is outside the range of allowed
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priorities for the scheduling policy currently in |attr|
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(1 to 99 for !SCHED_FIFO! and !SCHED_RR!; 0 for !SCHED_OTHER!).
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.RE
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The !pthread_attr_setschedpolicy! function returns the following error
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codes on error:
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.RS
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.TP
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!EINVAL!
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the specified |policy| is not one of !SCHED_OTHER!, !SCHED_FIFO!, or
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!SCHED_RR!.
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.TP
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!ENOTSUP!
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|policy| is !SCHED_FIFO! or !SCHED_RR!, and the effective user of the
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calling process is not super-user.
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.RE
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The !pthread_attr_setinheritsched! function returns the following error
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codes on error:
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.RS
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.TP
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!EINVAL!
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the specified |inherit| is not one of !PTHREAD_INHERIT_SCHED! or
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!PTHREAD_EXPLICIT_SCHED!.
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.RE
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The !pthread_attr_setscope! function returns the following error
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codes on error:
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.RS
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.TP
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!EINVAL!
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the specified |scope| is not one of !PTHREAD_SCOPE_SYSTEM! or
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!PTHREAD_SCOPE_PROCESS!.
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.TP
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!ENOTSUP!
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the specified |scope| is !PTHREAD_SCOPE_PROCESS! (not supported).
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.RE
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.SH AUTHOR
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Xavier Leroy <Xavier.Leroy@inria.fr>
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.SH "SEE ALSO"
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!pthread_create!(3),
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!pthread_join!(3),
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!pthread_detach!(3),
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!pthread_setschedparam!(3).
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