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authorZack Weinberg <zackw@panix.com>2017-06-08 15:39:03 -0400
committerZack Weinberg <zackw@panix.com>2017-06-08 15:39:03 -0400
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tree4470480d904b65cf14ca524f96f79eca818c3eaf /manual/threads.texi
parent199fc19d3aaaf57944ef036e15904febe877fc93 (diff)
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Prepare for radical source tree reorganization.zack/build-layout-experiment
All top-level files and directories are moved into a temporary storage directory, REORG.TODO, except for files that will certainly still exist in their current form at top level when we're done (COPYING, COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which are moved to the new directory OldChangeLogs, instead), and the generated file INSTALL (which is just deleted; in the new order, there will be no generated files checked into version control).
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-@node POSIX Threads
-@c @node POSIX Threads, Internal Probes, Cryptographic Functions, Top
-@chapter POSIX Threads
-@c %MENU% POSIX Threads
-@cindex pthreads
-
-This chapter describes the @glibcadj{} POSIX Threads implementation.
-
-@menu
-* Thread-specific Data:: Support for creating and
- managing thread-specific data
-* Non-POSIX Extensions:: Additional functions to extend
- POSIX Thread functionality
-@end menu
-
-@node Thread-specific Data
-@section Thread-specific Data
-
-The @glibcadj{} implements functions to allow users to create and manage
-data specific to a thread. Such data may be destroyed at thread exit,
-if a destructor is provided. The following functions are defined:
-
-@comment pthread.h
-@comment POSIX
-@deftypefun int pthread_key_create (pthread_key_t *@var{key}, void (*@var{destructor})(void*))
-@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
-@c pthread_key_create ok
-@c KEY_UNUSED ok
-@c KEY_USABLE ok
-Create a thread-specific data key for the calling thread, referenced by
-@var{key}.
-
-Objects declared with the C++11 @code{thread_local} keyword are destroyed
-before thread-specific data, so they should not be used in thread-specific
-data destructors or even as members of the thread-specific data, since the
-latter is passed as an argument to the destructor function.
-@end deftypefun
-
-@comment pthread.h
-@comment POSIX
-@deftypefun int pthread_key_delete (pthread_key_t @var{key})
-@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
-@c pthread_key_delete ok
-@c This uses atomic compare and exchange to increment the seq number
-@c after testing it's not a KEY_UNUSED seq number.
-@c KEY_UNUSED dup ok
-Destroy the thread-specific data @var{key} in the calling thread. The
-destructor for the thread-specific data is not called during destruction, nor
-is it called during thread exit.
-@end deftypefun
-
-@comment pthread.h
-@comment POSIX
-@deftypefun void *pthread_getspecific (pthread_key_t @var{key})
-@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
-@c pthread_getspecific ok
-Return the thread-specific data associated with @var{key} in the calling
-thread.
-@end deftypefun
-
-@comment pthread.h
-@comment POSIX
-@deftypefun int pthread_setspecific (pthread_key_t @var{key}, const void *@var{value})
-@safety{@prelim{}@mtsafe{}@asunsafe{@asucorrupt{} @ascuheap{}}@acunsafe{@acucorrupt{} @acsmem{}}}
-@c pthread_setspecific @asucorrupt @ascuheap @acucorrupt @acsmem
-@c a level2 block may be allocated by a signal handler after
-@c another call already made a decision to allocate it, thus losing
-@c the allocated value. the seq number is updated before the
-@c value, which might cause an earlier-generation value to seem
-@c current if setspecific is cancelled or interrupted by a signal
-@c KEY_UNUSED ok
-@c calloc dup @ascuheap @acsmem
-Associate the thread-specific @var{value} with @var{key} in the calling thread.
-@end deftypefun
-
-
-@node Non-POSIX Extensions
-@section Non-POSIX Extensions
-
-In addition to implementing the POSIX API for threads, @theglibc{} provides
-additional functions and interfaces to provide functionality not specified in
-the standard.
-
-@menu
-* Default Thread Attributes:: Setting default attributes for
- threads in a process.
-@end menu
-
-@node Default Thread Attributes
-@subsection Setting Process-wide defaults for thread attributes
-
-@Theglibc{} provides non-standard API functions to set and get the default
-attributes used in the creation of threads in a process.
-
-@comment pthread.h
-@comment GNU
-@deftypefun int pthread_getattr_default_np (pthread_attr_t *@var{attr})
-@safety{@prelim{}@mtsafe{}@asunsafe{@asulock{}}@acunsafe{@aculock{}}}
-@c Takes lock around read from default_pthread_attr.
-Get the default attribute values and set @var{attr} to match. This
-function returns @math{0} on success and a non-zero error code on
-failure.
-@end deftypefun
-
-@comment pthread.h
-@comment GNU
-@deftypefun int pthread_setattr_default_np (pthread_attr_t *@var{attr})
-@safety{@prelim{}@mtsafe{}@asunsafe{@ascuheap{} @asulock{}}@acunsafe{@aculock{} @acsmem{}}}
-@c pthread_setattr_default_np @ascuheap @asulock @aculock @acsmem
-@c check_sched_policy_attr ok
-@c check_sched_priority_attr ok
-@c sched_get_priority_min dup ok
-@c sched_get_priority_max dup ok
-@c check_stacksize_attr ok
-@c lll_lock @asulock @aculock
-@c free dup @ascuheap @acsmem
-@c realloc dup @ascuheap @acsmem
-@c memcpy dup ok
-@c lll_unlock @asulock @aculock
-Set the default attribute values to match the values in @var{attr}. The
-function returns @math{0} on success and a non-zero error code on failure.
-The following error codes are defined for this function:
-
-@table @code
-@item EINVAL
-At least one of the values in @var{attr} does not qualify as valid for the
-attributes or the stack address is set in the attribute.
-@item ENOMEM
-The system does not have sufficient memory.
-@end table
-@end deftypefun
-
-@c FIXME these are undocumented:
-@c pthread_atfork
-@c pthread_attr_destroy
-@c pthread_attr_getaffinity_np
-@c pthread_attr_getdetachstate
-@c pthread_attr_getguardsize
-@c pthread_attr_getinheritsched
-@c pthread_attr_getschedparam
-@c pthread_attr_getschedpolicy
-@c pthread_attr_getscope
-@c pthread_attr_getstack
-@c pthread_attr_getstackaddr
-@c pthread_attr_getstacksize
-@c pthread_attr_init
-@c pthread_attr_setaffinity_np
-@c pthread_attr_setdetachstate
-@c pthread_attr_setguardsize
-@c pthread_attr_setinheritsched
-@c pthread_attr_setschedparam
-@c pthread_attr_setschedpolicy
-@c pthread_attr_setscope
-@c pthread_attr_setstack
-@c pthread_attr_setstackaddr
-@c pthread_attr_setstacksize
-@c pthread_barrierattr_destroy
-@c pthread_barrierattr_getpshared
-@c pthread_barrierattr_init
-@c pthread_barrierattr_setpshared
-@c pthread_barrier_destroy
-@c pthread_barrier_init
-@c pthread_barrier_wait
-@c pthread_cancel
-@c pthread_cleanup_push
-@c pthread_cleanup_pop
-@c pthread_condattr_destroy
-@c pthread_condattr_getclock
-@c pthread_condattr_getpshared
-@c pthread_condattr_init
-@c pthread_condattr_setclock
-@c pthread_condattr_setpshared
-@c pthread_cond_broadcast
-@c pthread_cond_destroy
-@c pthread_cond_init
-@c pthread_cond_signal
-@c pthread_cond_timedwait
-@c pthread_cond_wait
-@c pthread_create
-@c pthread_detach
-@c pthread_equal
-@c pthread_exit
-@c pthread_getaffinity_np
-@c pthread_getattr_np
-@c pthread_getconcurrency
-@c pthread_getcpuclockid
-@c pthread_getname_np
-@c pthread_getschedparam
-@c pthread_join
-@c pthread_kill
-@c pthread_kill_other_threads_np
-@c pthread_mutexattr_destroy
-@c pthread_mutexattr_getkind_np
-@c pthread_mutexattr_getprioceiling
-@c pthread_mutexattr_getprotocol
-@c pthread_mutexattr_getpshared
-@c pthread_mutexattr_getrobust
-@c pthread_mutexattr_getrobust_np
-@c pthread_mutexattr_gettype
-@c pthread_mutexattr_init
-@c pthread_mutexattr_setkind_np
-@c pthread_mutexattr_setprioceiling
-@c pthread_mutexattr_setprotocol
-@c pthread_mutexattr_setpshared
-@c pthread_mutexattr_setrobust
-@c pthread_mutexattr_setrobust_np
-@c pthread_mutexattr_settype
-@c pthread_mutex_consistent
-@c pthread_mutex_consistent_np
-@c pthread_mutex_destroy
-@c pthread_mutex_getprioceiling
-@c pthread_mutex_init
-@c pthread_mutex_lock
-@c pthread_mutex_setprioceiling
-@c pthread_mutex_timedlock
-@c pthread_mutex_trylock
-@c pthread_mutex_unlock
-@c pthread_once
-@c pthread_rwlockattr_destroy
-@c pthread_rwlockattr_getkind_np
-@c pthread_rwlockattr_getpshared
-@c pthread_rwlockattr_init
-@c pthread_rwlockattr_setkind_np
-@c pthread_rwlockattr_setpshared
-@c pthread_rwlock_destroy
-@c pthread_rwlock_init
-@c pthread_rwlock_rdlock
-@c pthread_rwlock_timedrdlock
-@c pthread_rwlock_timedwrlock
-@c pthread_rwlock_tryrdlock
-@c pthread_rwlock_trywrlock
-@c pthread_rwlock_unlock
-@c pthread_rwlock_wrlock
-@c pthread_self
-@c pthread_setaffinity_np
-@c pthread_setcancelstate
-@c pthread_setcanceltype
-@c pthread_setconcurrency
-@c pthread_setname_np
-@c pthread_setschedparam
-@c pthread_setschedprio
-@c pthread_sigmask
-@c pthread_sigqueue
-@c pthread_spin_destroy
-@c pthread_spin_init
-@c pthread_spin_lock
-@c pthread_spin_trylock
-@c pthread_spin_unlock
-@c pthread_testcancel
-@c pthread_timedjoin_np
-@c pthread_tryjoin_np
-@c pthread_yield