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>Thread Management [POSIX Section 16]</TITLE
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NAME="POSIX-THREAD-MANAGEMENT">Thread Management [POSIX Section 16]</H1
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><A
NAME="AEN13263">Functions Implemented</H2
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>int pthread_attr_init(pthread_attr_t *attr);
int pthread_attr_destroy(pthread_attr_t *attr);
int pthread_attr_setdetachstate(pthread_attr_t *attr,
int detachstate);
int pthread_attr_getdetachstate(const pthread_attr_t *attr,
int *detachstate);
int pthread_attr_setstackaddr(pthread_attr_t *attr,
void *stackaddr);
int pthread_attr_getstackaddr(const pthread_attr_t *attr,
void **stackaddr);
int pthread_attr_setstacksize(pthread_attr_t *attr,
size_t stacksize);
int pthread_attr_getstacksize(const pthread_attr_t *attr,
size_t *stacksize);
int pthread_create( pthread_t *thread,
const pthread_attr_t *attr,
void *(*start_routine)(void *),
void *arg);
pthread_t pthread_self( void );
int pthread_equal(pthread_t thread1, pthread_t thread2);
void pthread_exit(void *retval);
int pthread_join(pthread_t thread, void **thread_return);
int pthread_detach(pthread_t thread);
int pthread_once(pthread_once_t *once_control,
void (*init_routine)(void));</PRE
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> The presence of thread support as a whole is controlled by the the
CYGPKG_POSIX_PTHREAD configuration option. Note that disabling
this will also disable many other features of the POSIX package,
since these are intimately bound up with the thread mechanism.
</P
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> The default (non-scheduling) thread attributes are:
</P
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> detachstate PTHREAD_CREATE_JOINABLE
stackaddr unset
stacksize unset
</PRE
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><P
> Dynamic thread stack allocation is only provided if there is an
implementation of
<SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>malloc()</I
></SPAN
> configured (i.e. a package
implements the
CYGINT_MEMALLOC_MALLOC_ALLOCATORS
interface). If there is no malloc() available, then the thread
creator must supply a stack. If only a stack address is supplied
then the stack is assumed to be PTHREAD_STACK_MIN
bytes long. This size is seldom useful for any but the most
trivial of threads. If a different sized stack is used, both
the stack address and stack size must be supplied.
</P
></LI
><LI
><P
> The value of PTHREAD_THREADS_MAX is supplied by
the CYGNUM_POSIX_PTHREAD_THREADS_MAX
option. This defines the maximum number of threads allowed. The
POSIX standard requires this value to be at least 64, and this
is the default value set.
</P
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><P
> When the POSIX package is installed, the thread that calls
<SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>main()</I
></SPAN
> is initialized as a POSIX thread. The
priority of that thread is controlled by the
CYGNUM_POSIX_MAIN_DEFAULT_PRIORITY option.
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