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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 Thread 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 |