Comtrol eCos - Manual (Page 468)

Chapter 31. POSIX Standard Support
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.
• 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.
• When the POSIX package is installed, the thread that calls main() is initialized as a POSIX thread. The priority
of that thread is controlled by the CYGNUM_POSIX_MAIN_DEFAULT_PRIORITY option.
Thread-Specific Data [POSIX Section 17]
Functions Implemented
int pthread_key_create(pthread_key_t ∗ key,
void ( ∗ destructor)(void ∗ ));
int pthread_setspecific(pthread_key_t key, const void ∗ pointer);
void ∗ pthread_getspecific(pthread_key_t key);
int pthread_key_delete(pthread_key_t key);
Functions Omitted
<none>
Notes
• The value of PTHREAD_DESTRUCTOR_ITERATIONS is provided by the
CYGNUM_POSIX_PTHREAD_DESTRUCTOR_ITERATIONS option. This controls the number of times
that a key destructor will be called while the data item remains non-NULL.
• The value of PTHREAD_KEYS_MAX is provided by the CYGNUM_POSIX_PTHREAD_KEYS_MAX op-
tion. This defines the maximum number of per-thread data items supported. The POSIX standard calls for this
to be a minimum of 128, which is rather large for an embedded system. The default value for this option is set
to 128 for compatibility but it should be reduced to a more usable value.
Thread Cancellation [POSIX Section 18]
Functions Implemented
int pthread_cancel(pthread_t thread);
int pthread_setcancelstate(int state, int ∗ oldstate);
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