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/* thread.h
*
* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
* by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/

#if defined(USE_ITHREADS)

#if defined(VMS)
#include <builtins.h>
#endif

#ifdef WIN32
# include <win32thread.h>
#else
#ifdef NETWARE
# include <nw5thread.h>
#else
# ifdef OLD_PTHREADS_API /* Here be dragons. */
# define DETACH(t) \
STMT_START { \
int _eC_; \
if ((_eC_ = pthread_detach(&(t)->self))) { \
MUTEX_UNLOCK(&(t)->mutex); \
Perl_croak_nocontext("panic: DETACH (%d) [%s:%d]", \
_eC_, __FILE__, __LINE__); \
} \
} STMT_END

# define PERL_GET_CONTEXT Perl_get_context()
# define PERL_SET_CONTEXT(t) Perl_set_context((void*)t)

# define PTHREAD_GETSPECIFIC_INT
# ifdef DJGPP
# define pthread_addr_t any_t
# define NEED_PTHREAD_INIT
# define PTHREAD_CREATE_JOINABLE (1)
# endif
# ifdef OEMVS
# define pthread_addr_t void *
# define pthread_create(t,a,s,d) pthread_create(t,&(a),s,d)
# define pthread_keycreate pthread_key_create
# endif
# ifdef VMS
# define pthread_attr_init(a) pthread_attr_create(a)
# define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_setdetach_np(a,s)
# define PTHREAD_CREATE(t,a,s,d) pthread_create(t,a,s,d)
# define pthread_key_create(k,d) pthread_keycreate(k,(pthread_destructor_t)(d))
# define pthread_mutexattr_init(a) pthread_mutexattr_create(a)
# define pthread_mutexattr_settype(a,t) pthread_mutexattr_setkind_np(a,t)
# endif
# if defined(__hpux) && defined(__ux_version) && __ux_version <= 1020
# define pthread_attr_init(a) pthread_attr_create(a)
       /* XXX pthread_setdetach_np() missing in DCE threads on HP-UX 10.20 */
# define PTHREAD_ATTR_SETDETACHSTATE(a,s) (0)
# define PTHREAD_CREATE(t,a,s,d) pthread_create(t,a,s,d)
# define pthread_key_create(k,d) pthread_keycreate(k,(pthread_destructor_t)(d))
# define pthread_mutexattr_init(a) pthread_mutexattr_create(a)
# define pthread_mutexattr_settype(a,t) pthread_mutexattr_setkind_np(a,t)
# endif
# if defined(DJGPP) || defined(OEMVS)
# define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_attr_setdetachstate(a,&(s))
# define YIELD pthread_yield(NULL)
# endif
# endif
# if !defined(__hpux) || !defined(__ux_version) || __ux_version > 1020
# define pthread_mutexattr_default NULL
# define pthread_condattr_default NULL
# endif
#endif /* NETWARE */
#endif

#ifndef PTHREAD_CREATE
/* You are not supposed to pass NULL as the 2nd arg of PTHREAD_CREATE(). */
# define PTHREAD_CREATE(t,a,s,d) pthread_create(t,&(a),s,d)
#endif

#ifndef PTHREAD_ATTR_SETDETACHSTATE
# define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_attr_setdetachstate(a,s)
#endif

#ifndef PTHREAD_CREATE_JOINABLE
# ifdef OLD_PTHREAD_CREATE_JOINABLE
# define PTHREAD_CREATE_JOINABLE OLD_PTHREAD_CREATE_JOINABLE
# else
# define PTHREAD_CREATE_JOINABLE 0 /* Panic? No, guess. */
# endif
#endif

#ifdef __VMS
  /* Default is 1024 on VAX, 8192 otherwise */
# ifdef __ia64
# define THREAD_CREATE_NEEDS_STACK (48*1024)
# else
# define THREAD_CREATE_NEEDS_STACK (32*1024)
# endif
#endif

#ifdef I_MACH_CTHREADS

/* cthreads interface */

/* #include <mach/cthreads.h> is in perl.h #ifdef I_MACH_CTHREADS */

#define MUTEX_INIT(m) \
STMT_START { \
*m = mutex_alloc(); \
if (*m) { \
mutex_init(*m); \
} else { \
Perl_croak_nocontext("panic: MUTEX_INIT [%s:%d]", \
__FILE__, __LINE__); \
} \
} STMT_END

#define MUTEX_LOCK(m) mutex_lock(*m)
#define MUTEX_UNLOCK(m) mutex_unlock(*m)
#define MUTEX_DESTROY(m) \
STMT_START { \
mutex_free(*m); \
*m = 0; \
} STMT_END

#define COND_INIT(c) \
STMT_START { \
*c = condition_alloc(); \
if (*c) { \
condition_init(*c); \
} \
else { \
Perl_croak_nocontext("panic: COND_INIT [%s:%d]", \
__FILE__, __LINE__); \
} \
} STMT_END

#define COND_SIGNAL(c) condition_signal(*c)
#define COND_BROADCAST(c) condition_broadcast(*c)
#define COND_WAIT(c, m) condition_wait(*c, *m)
#define COND_DESTROY(c) \
STMT_START { \
condition_free(*c); \
*c = 0; \
} STMT_END

#define THREAD_CREATE(thr, f) (thr->self = cthread_fork(f, thr), 0)
#define THREAD_POST_CREATE(thr)

#define THREAD_RET_TYPE any_t
#define THREAD_RET_CAST(x) ((any_t) x)

#define DETACH(t) cthread_detach(t->self)
#define JOIN(t, avp) (*(avp) = MUTABLE_AV(cthread_join(t->self)))

#define PERL_SET_CONTEXT(t) cthread_set_data(cthread_self(), t)
#define PERL_GET_CONTEXT cthread_data(cthread_self())

#define INIT_THREADS cthread_init()
#define YIELD cthread_yield()
#define ALLOC_THREAD_KEY NOOP
#define FREE_THREAD_KEY NOOP
#define SET_THREAD_SELF(thr) (thr->self = cthread_self())

#endif /* I_MACH_CTHREADS */

#ifndef YIELD
# ifdef SCHED_YIELD
# define YIELD SCHED_YIELD
# else
# ifdef HAS_SCHED_YIELD
# define YIELD sched_yield()
# else
# ifdef HAS_PTHREAD_YIELD
    /* pthread_yield(NULL) platforms are expected
* to have #defined YIELD for themselves. */
# define YIELD pthread_yield()
# endif
# endif
# endif
#endif

#ifdef __hpux
# define MUTEX_INIT_NEEDS_MUTEX_ZEROED
#endif

#ifndef MUTEX_INIT

# ifdef MUTEX_INIT_NEEDS_MUTEX_ZEROED
    /* Temporary workaround, true bug is deeper. --jhi 1999-02-25 */
# define MUTEX_INIT(m) \
STMT_START { \
int _eC_; \
Zero((m), 1, perl_mutex); \
if ((_eC_ = pthread_mutex_init((m), pthread_mutexattr_default))) \
Perl_croak_nocontext("panic: MUTEX_INIT (%d) [%s:%d]", \
_eC_, __FILE__, __LINE__); \
} STMT_END
# else
# define MUTEX_INIT(m) \
STMT_START { \
int _eC_; \
if ((_eC_ = pthread_mutex_init((m), pthread_mutexattr_default))) \
Perl_croak_nocontext("panic: MUTEX_INIT (%d) [%s:%d]", \
_eC_, __FILE__, __LINE__); \
} STMT_END
# endif

# define MUTEX_LOCK(m) \
STMT_START { \
int _eC_; \
if ((_eC_ = pthread_mutex_lock((m)))) \
Perl_croak_nocontext("panic: MUTEX_LOCK (%d) [%s:%d]", \
_eC_, __FILE__, __LINE__); \
} STMT_END

# define MUTEX_UNLOCK(m) \
STMT_START { \
int _eC_; \
if ((_eC_ = pthread_mutex_unlock((m)))) \
Perl_croak_nocontext("panic: MUTEX_UNLOCK (%d) [%s:%d]", \
_eC_, __FILE__, __LINE__); \
} STMT_END

# define MUTEX_DESTROY(m) \
STMT_START { \
int _eC_; \
if ((_eC_ = pthread_mutex_destroy((m)))) \
Perl_croak_nocontext("panic: MUTEX_DESTROY (%d) [%s:%d]", \
_eC_, __FILE__, __LINE__); \
} STMT_END
#endif /* MUTEX_INIT */

#ifndef COND_INIT
# define COND_INIT(c) \
STMT_START { \
int _eC_; \
if ((_eC_ = pthread_cond_init((c), pthread_condattr_default))) \
Perl_croak_nocontext("panic: COND_INIT (%d) [%s:%d]", \
_eC_, __FILE__, __LINE__); \
} STMT_END

# define COND_SIGNAL(c) \
STMT_START { \
int _eC_; \
if ((_eC_ = pthread_cond_signal((c)))) \
Perl_croak_nocontext("panic: COND_SIGNAL (%d) [%s:%d]", \
_eC_, __FILE__, __LINE__); \
} STMT_END

# define COND_BROADCAST(c) \
STMT_START { \
int _eC_; \
if ((_eC_ = pthread_cond_broadcast((c)))) \
Perl_croak_nocontext("panic: COND_BROADCAST (%d) [%s:%d]", \
_eC_, __FILE__, __LINE__); \
} STMT_END

# define COND_WAIT(c, m) \
STMT_START { \
int _eC_; \
if ((_eC_ = pthread_cond_wait((c), (m)))) \
Perl_croak_nocontext("panic: COND_WAIT (%d) [%s:%d]", \
_eC_, __FILE__, __LINE__); \
} STMT_END

# define COND_DESTROY(c) \
STMT_START { \
int _eC_; \
if ((_eC_ = pthread_cond_destroy((c)))) \
Perl_croak_nocontext("panic: COND_DESTROY (%d) [%s:%d]", \
_eC_, __FILE__, __LINE__); \
} STMT_END
#endif /* COND_INIT */

/* DETACH(t) must only be called while holding t->mutex */
#ifndef DETACH
# define DETACH(t) \
STMT_START { \
int _eC_; \
if ((_eC_ = pthread_detach((t)->self))) { \
MUTEX_UNLOCK(&(t)->mutex); \
Perl_croak_nocontext("panic: DETACH (%d) [%s:%d]", \
_eC_, __FILE__, __LINE__); \
} \
} STMT_END
#endif /* DETACH */

#ifndef JOIN
# define JOIN(t, avp) \
STMT_START { \
int _eC_; \
if ((_eC_ = pthread_join((t)->self, (void**)(avp)))) \
Perl_croak_nocontext("panic: pthread_join (%d) [%s:%d]", \
_eC_, __FILE__, __LINE__); \
} STMT_END
#endif /* JOIN */

/* Use an unchecked fetch of thread-specific data instead of a checked one.
* It would fail if the key were bogus, but if the key were bogus then
* Really Bad Things would be happening anyway. --dan */
#if (defined(__ALPHA) && (__VMS_VER >= 70000000)) || \
(defined(__alpha) && defined(__osf__) && !defined(__GNUC__)) /* Available only on >= 4.0 */
# define HAS_PTHREAD_UNCHECKED_GETSPECIFIC_NP /* Configure test needed */
#endif

#ifdef HAS_PTHREAD_UNCHECKED_GETSPECIFIC_NP
# define PTHREAD_GETSPECIFIC(key) pthread_unchecked_getspecific_np(key)
#else
# define PTHREAD_GETSPECIFIC(key) pthread_getspecific(key)
#endif

#ifndef PERL_GET_CONTEXT
# define PERL_GET_CONTEXT PTHREAD_GETSPECIFIC(PL_thr_key)
#endif

#ifndef PERL_SET_CONTEXT
# define PERL_SET_CONTEXT(t) \
STMT_START { \
int _eC_; \
if ((_eC_ = pthread_setspecific(PL_thr_key, (void *)(t)))) \
Perl_croak_nocontext("panic: pthread_setspecific (%d) [%s:%d]", \
_eC_, __FILE__, __LINE__); \
} STMT_END
#endif /* PERL_SET_CONTEXT */

#ifndef INIT_THREADS
# ifdef NEED_PTHREAD_INIT
# define INIT_THREADS pthread_init()
# endif
#endif

#ifndef ALLOC_THREAD_KEY
# define ALLOC_THREAD_KEY \
STMT_START { \
if (pthread_key_create(&PL_thr_key, 0)) { \
int rc; \
rc = write(2, STR_WITH_LEN("panic: pthread_key_create failed\n")); \
PERL_UNUSED_VAR(rc); \
exit(1); \
} \
} STMT_END
#endif

#ifndef FREE_THREAD_KEY
# define FREE_THREAD_KEY \
STMT_START { \
pthread_key_delete(PL_thr_key); \
} STMT_END
#endif

#ifndef PTHREAD_ATFORK
# ifdef HAS_PTHREAD_ATFORK
# define PTHREAD_ATFORK(prepare,parent,child) \
pthread_atfork(prepare,parent,child)
# else
# define PTHREAD_ATFORK(prepare,parent,child) \
NOOP
# endif
#endif

#ifndef THREAD_RET_TYPE
# define THREAD_RET_TYPE void *
# define THREAD_RET_CAST(p) ((void *)(p))
#endif /* THREAD_RET */

# define LOCK_DOLLARZERO_MUTEX MUTEX_LOCK(&PL_dollarzero_mutex)
# define UNLOCK_DOLLARZERO_MUTEX MUTEX_UNLOCK(&PL_dollarzero_mutex)

#endif /* USE_ITHREADS */

#ifndef MUTEX_LOCK
# define MUTEX_LOCK(m)
#endif

#ifndef MUTEX_UNLOCK
# define MUTEX_UNLOCK(m)
#endif

#ifndef MUTEX_INIT
# define MUTEX_INIT(m)
#endif

#ifndef MUTEX_DESTROY
# define MUTEX_DESTROY(m)
#endif

#ifndef COND_INIT
# define COND_INIT(c)
#endif

#ifndef COND_SIGNAL
# define COND_SIGNAL(c)
#endif

#ifndef COND_BROADCAST
# define COND_BROADCAST(c)
#endif

#ifndef COND_WAIT
# define COND_WAIT(c, m)
#endif

#ifndef COND_DESTROY
# define COND_DESTROY(c)
#endif

#ifndef LOCK_DOLLARZERO_MUTEX
# define LOCK_DOLLARZERO_MUTEX
#endif

#ifndef UNLOCK_DOLLARZERO_MUTEX
# define UNLOCK_DOLLARZERO_MUTEX
#endif

/* THR, SET_THR, and dTHR are there for compatibility with old versions */
#ifndef THR
# define THR PERL_GET_THX
#endif

#ifndef SET_THR
# define SET_THR(t) PERL_SET_THX(t)
#endif

#ifndef dTHR
# define dTHR dNOOP
#endif

#ifndef INIT_THREADS
# define INIT_THREADS NOOP
#endif

/*
* Local variables:
* c-indentation-style: bsd
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*
* ex: set ts=8 sts=4 sw=4 et:
*/
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