text: /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
  /* ***** BEGIN LICENSE BLOCK *****
   * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   *
   * The contents of this file are subject to the Mozilla Public License Version
   * 1.1 (the "License"); you may not use this file except in compliance with
   * the License. You may obtain a copy of the License at
   * http://www.mozilla.org/MPL/
   *
   * Software distributed under the License is distributed on an "AS IS" basis,
   * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
   * for the specific language governing rights and limitations under the
   * License.
   *
   * The Original Code is the Netscape Portable Runtime (NSPR).
   *
   * The Initial Developer of the Original Code is
   * Netscape Communications Corporation.
   * Portions created by the Initial Developer are Copyright (C) 1998-2000
   * the Initial Developer. All Rights Reserved.
   *
   * Contributor(s):
   *
   * Alternatively, the contents of this file may be used under the terms of
   * either the GNU General Public License Version 2 or later (the "GPL"), or
   * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
   * in which case the provisions of the GPL or the LGPL are applicable instead
   * of those above. If you wish to allow use of your version of this file only
   * under the terms of either the GPL or the LGPL, and not to allow others to
   * use your version of this file under the terms of the MPL, indicate your
   * decision by deleting the provisions above and replace them with the notice
   * and other provisions required by the GPL or the LGPL. If you do not delete
   * the provisions above, a recipient may use your version of this file under
   * the terms of any one of the MPL, the GPL or the LGPL.
   *
   * ***** END LICENSE BLOCK ***** */
  
  #ifndef nspr_pth_defs_h_
  #define nspr_pth_defs_h_
  
  /*
  ** Appropriate definitions of entry points not used in a pthreads world
  */
  #define _PR_MD_BLOCK_CLOCK_INTERRUPTS()
  #define _PR_MD_UNBLOCK_CLOCK_INTERRUPTS()
  #define _PR_MD_DISABLE_CLOCK_INTERRUPTS()
  #define _PR_MD_ENABLE_CLOCK_INTERRUPTS()
  
  /* In good standards fashion, the DCE threads (based on posix-4) are not
   * quite the same as newer posix implementations.  These are mostly name
   * changes and small differences, so macros usually do the trick
   */
  #ifdef _PR_DCETHREADS
  #define _PT_PTHREAD_MUTEXATTR_INIT        pthread_mutexattr_create
  #define _PT_PTHREAD_MUTEXATTR_DESTROY     pthread_mutexattr_delete
  #define _PT_PTHREAD_MUTEX_INIT(m, a)      pthread_mutex_init(&(m), a)
  #define _PT_PTHREAD_MUTEX_IS_LOCKED(m)    (0 == pthread_mutex_trylock(&(m)))
  #define _PT_PTHREAD_CONDATTR_INIT         pthread_condattr_create
  #define _PT_PTHREAD_COND_INIT(m, a)       pthread_cond_init(&(m), a)
  #define _PT_PTHREAD_CONDATTR_DESTROY      pthread_condattr_delete
  
  /* Notes about differences between DCE threads and pthreads 10:
   *   1. pthread_mutex_trylock returns 1 when it locks the mutex
   *      0 when it does not.  The latest pthreads has a set of errno-like
   *      return values.
   *   2. return values from pthread_cond_timedwait are different.
   *
   *
   *
   */
  #elif defined(BSDI)
  /*
   * Mutex and condition attributes are not supported.  The attr
   * argument to pthread_mutex_init() and pthread_cond_init() must
   * be passed as NULL.
   *
   * The memset calls in _PT_PTHREAD_MUTEX_INIT and _PT_PTHREAD_COND_INIT
   * are to work around BSDI's using a single bit to indicate a mutex
   * or condition variable is initialized.  This entire BSDI section
   * will go away when BSDI releases updated threads libraries for
   * BSD/OS 3.1 and 4.0.
   */
  #define _PT_PTHREAD_MUTEXATTR_INIT(x)     0
  #define _PT_PTHREAD_MUTEXATTR_DESTROY(x)  /* */
  #define _PT_PTHREAD_MUTEX_INIT(m, a)      (memset(&(m), 0, sizeof(m)), \
                                        pthread_mutex_init(&(m), NULL))
  #define _PT_PTHREAD_MUTEX_IS_LOCKED(m)    (EBUSY == pthread_mutex_trylock(&(m)))
  #define _PT_PTHREAD_CONDATTR_INIT(x)      0
  #define _PT_PTHREAD_CONDATTR_DESTROY(x)   /* */
  #define _PT_PTHREAD_COND_INIT(m, a)       (memset(&(m), 0, sizeof(m)), \
                                        pthread_cond_init(&(m), NULL))
  #else
  #define _PT_PTHREAD_MUTEXATTR_INIT        pthread_mutexattr_init
  #define _PT_PTHREAD_MUTEXATTR_DESTROY     pthread_mutexattr_destroy
  #define _PT_PTHREAD_MUTEX_INIT(m, a)      pthread_mutex_init(&(m), &(a))
  #if defined(FREEBSD)
  #define _PT_PTHREAD_MUTEX_IS_LOCKED(m)    pt_pthread_mutex_is_locked(&(m))
  #else
  #define _PT_PTHREAD_MUTEX_IS_LOCKED(m)    (EBUSY == pthread_mutex_trylock(&(m)))
  #endif
  #if defined(ANDROID)
  /* Conditional attribute init and destroy aren't implemented in bionic. */
  #define _PT_PTHREAD_CONDATTR_INIT(x)      0
  #define _PT_PTHREAD_CONDATTR_DESTROY(x)   /* */
  #else
  #define _PT_PTHREAD_CONDATTR_INIT         pthread_condattr_init
  #define _PT_PTHREAD_CONDATTR_DESTROY      pthread_condattr_destroy
  #endif
  #define _PT_PTHREAD_COND_INIT(m, a)       pthread_cond_init(&(m), &(a))
  #endif
  
  /* The pthreads standard does not specify an invalid value for the
   * pthread_t handle.  (0 is usually an invalid pthread identifier
   * but there are exceptions, for example, DG/UX.)  These macros
   * define a way to set the handle to or compare the handle with an
   * invalid identifier.  These macros are not portable and may be
   * more of a problem as we adapt to more pthreads implementations.
   * They are only used in the PRMonitor functions.  Do not use them
   * in new code.
   *
   * Unfortunately some of our clients depend on certain properties
   * of our PRMonitor implementation, preventing us from replacing
   * it by a portable implementation.
   * - High-performance servers like the fact that PR_EnterMonitor
   *   only calls PR_Lock and PR_ExitMonitor only calls PR_Unlock.
   *   (A portable implementation would use a PRLock and a PRCondVar
   *   to implement the recursive lock in a monitor and call both
   *   PR_Lock and PR_Unlock in PR_EnterMonitor and PR_ExitMonitor.)
   *   Unfortunately this forces us to read the monitor owner field
   *   without holding a lock.
   * - One way to make it safe to read the monitor owner field
   *   without holding a lock is to make that field a PRThread*
   *   (one should be able to read a pointer with a single machine
   *   instruction).  However, PR_GetCurrentThread calls calloc if
   *   it is called by a thread that was not created by NSPR.  The
   *   malloc tracing tools in the Mozilla client use PRMonitor for
   *   locking in their malloc, calloc, and free functions.  If
   *   PR_EnterMonitor calls any of these functions, infinite
   *   recursion ensues.
   */
  #if defined(_PR_DCETHREADS)
  #define _PT_PTHREAD_INVALIDATE_THR_HANDLE(t) \
  	memset(&(t), 0, sizeof(pthread_t))
  #define _PT_PTHREAD_THR_HANDLE_IS_INVALID(t) \
  	(!memcmp(&(t), &pt_zero_tid, sizeof(pthread_t)))
  #define _PT_PTHREAD_COPY_THR_HANDLE(st, dt)   (dt) = (st)
  #elif defined(IRIX) || defined(OSF1) || defined(AIX) || defined(SOLARIS) \
  	|| defined(LINUX) || defined(__GNU__) || defined(__GLIBC__) \
  	|| defined(HPUX) || defined(FREEBSD) \
  	|| defined(NETBSD) || defined(OPENBSD) || defined(BSDI) \
  	|| defined(NTO) || defined(DARWIN) \
  	|| defined(UNIXWARE) || defined(RISCOS)	|| defined(SYMBIAN)
  #ifdef __GNU__
  /* Hurd pthreads don't have an invalid value for pthread_t. -- rmh */
  #error Using Hurd pthreads
  #endif
  #define _PT_PTHREAD_INVALIDATE_THR_HANDLE(t)  (t) = 0
  #define _PT_PTHREAD_THR_HANDLE_IS_INVALID(t)  (t) == 0
  #define _PT_PTHREAD_COPY_THR_HANDLE(st, dt)   (dt) = (st)
  #else 
  #error "pthreads is not supported for this architecture"
  #endif
  
  #if defined(_PR_DCETHREADS)
  #define _PT_PTHREAD_ATTR_INIT            pthread_attr_create
  #define _PT_PTHREAD_ATTR_DESTROY         pthread_attr_delete
  #define _PT_PTHREAD_CREATE(t, a, f, r)   pthread_create(t, a, f, r) 
  #define _PT_PTHREAD_KEY_CREATE           pthread_keycreate
  #define _PT_PTHREAD_ATTR_SETSCHEDPOLICY  pthread_attr_setsched
  #define _PT_PTHREAD_ATTR_GETSTACKSIZE(a, s) \
                                       (*(s) = pthread_attr_getstacksize(*(a)), 0)
  #define _PT_PTHREAD_GETSPECIFIC(k, r) \
  		pthread_getspecific((k), (pthread_addr_t *) &(r))
  #elif defined(_PR_PTHREADS)
  #define _PT_PTHREAD_ATTR_INIT            pthread_attr_init
  #define _PT_PTHREAD_ATTR_DESTROY         pthread_attr_destroy
  #define _PT_PTHREAD_CREATE(t, a, f, r)   pthread_create(t, &a, f, r) 
  #define _PT_PTHREAD_KEY_CREATE           pthread_key_create
  #define _PT_PTHREAD_ATTR_SETSCHEDPOLICY  pthread_attr_setschedpolicy
  #define _PT_PTHREAD_ATTR_GETSTACKSIZE(a, s) pthread_attr_getstacksize(a, s)
  #define _PT_PTHREAD_GETSPECIFIC(k, r)    (r) = pthread_getspecific(k)
  #else
  #error "Cannot determine pthread strategy"
  #endif
  
  #if defined(_PR_DCETHREADS)
  #define _PT_PTHREAD_EXPLICIT_SCHED      _PT_PTHREAD_DEFAULT_SCHED
  #endif
  
  /*
   * pthread_mutex_trylock returns different values in DCE threads and
   * pthreads.
   */
  #if defined(_PR_DCETHREADS)
  #define PT_TRYLOCK_SUCCESS 1
  #define PT_TRYLOCK_BUSY    0
  #else
  #define PT_TRYLOCK_SUCCESS 0
  #define PT_TRYLOCK_BUSY    EBUSY
  #endif
  
  /*
   * These platforms don't have sigtimedwait()
   */
  #if (defined(AIX) && !defined(AIX4_3_PLUS)) \
  	|| defined(LINUX) || defined(__GNU__)|| defined(__GLIBC__) \
  	|| defined(FREEBSD) || defined(NETBSD) || defined(OPENBSD) \
  	|| defined(BSDI) || defined(UNIXWARE) \
  	|| defined(DARWIN) || defined(SYMBIAN)
  #define PT_NO_SIGTIMEDWAIT
  #endif
  
  #if defined(OSF1)
  #define PT_PRIO_MIN            PRI_OTHER_MIN
  #define PT_PRIO_MAX            PRI_OTHER_MAX
  #elif defined(IRIX)
  #include <sys/sched.h>
  #define PT_PRIO_MIN            PX_PRIO_MIN
  #define PT_PRIO_MAX            PX_PRIO_MAX
  #elif defined(AIX)
  #include <sys/priv.h>
  #include <sys/sched.h>
  #ifndef PTHREAD_CREATE_JOINABLE
  #define PTHREAD_CREATE_JOINABLE     PTHREAD_CREATE_UNDETACHED
  #endif
  #define PT_PRIO_MIN            DEFAULT_PRIO
  #define PT_PRIO_MAX            DEFAULT_PRIO
  #elif defined(HPUX)
  
  #if defined(_PR_DCETHREADS)
  #define PT_PRIO_MIN            PRI_OTHER_MIN
  #define PT_PRIO_MAX            PRI_OTHER_MAX
  #else /* defined(_PR_DCETHREADS) */
  #include <sys/sched.h>
  #define PT_PRIO_MIN            sched_get_priority_min(SCHED_OTHER)
  #define PT_PRIO_MAX            sched_get_priority_max(SCHED_OTHER)
  #endif /* defined(_PR_DCETHREADS) */
  
  #elif defined(LINUX) || defined(__GNU__) || defined(__GLIBC__) \
  	|| defined(FREEBSD) || defined(SYMBIAN)
  #define PT_PRIO_MIN            sched_get_priority_min(SCHED_OTHER)
  #define PT_PRIO_MAX            sched_get_priority_max(SCHED_OTHER)
  #elif defined(NTO)
  /*
   * Neutrino has functions that return the priority range but
   * they return invalid numbers, so I just hard coded these here
   * for now.  Jerry.Kirk@Nexarecorp.com
   */
  #define PT_PRIO_MIN            0
  #define PT_PRIO_MAX            30
  #elif defined(SOLARIS)
  /*
   * Solaris doesn't seem to have macros for the min/max priorities.
   * The range of 0-127 is mentioned in the pthread_setschedparam(3T)
   * man pages, and pthread_setschedparam indeed allows 0-127.  However,
   * pthread_attr_setschedparam does not allow 0; it allows 1-127.
   */
  #define PT_PRIO_MIN            1
  #define PT_PRIO_MAX            127
  #elif defined(OPENBSD)
  #define PT_PRIO_MIN            0
  #define PT_PRIO_MAX            31
  #elif defined(NETBSD) \
  	|| defined(BSDI) || defined(DARWIN) || defined(UNIXWARE) \
  	|| defined(RISCOS) /* XXX */
  #define PT_PRIO_MIN            0
  #define PT_PRIO_MAX            126
  #else
  #error "pthreads is not supported for this architecture"
  #endif
  
  /*
   * The _PT_PTHREAD_YIELD function is called from a signal handler.
   * Needed for garbage collection -- Look at PR_Suspend/PR_Resume
   * implementation.
   */
  #if defined(_PR_DCETHREADS)
  #define _PT_PTHREAD_YIELD()            	pthread_yield()
  #elif defined(OSF1)
  /*
   * sched_yield can't be called from a signal handler.  Must use
   * the _np version.
   */
  #define _PT_PTHREAD_YIELD()            	pthread_yield_np()
  #elif defined(AIX)
  extern int (*_PT_aix_yield_fcn)();
  #define _PT_PTHREAD_YIELD()			(*_PT_aix_yield_fcn)()
  #elif defined(IRIX)
  #include <time.h>
  #define _PT_PTHREAD_YIELD() \
      PR_BEGIN_MACRO               				\
  		struct timespec onemillisec = {0};		\
  		onemillisec.tv_nsec = 1000000L;			\
          nanosleep(&onemillisec,NULL);			\
      PR_END_MACRO
  #elif defined(HPUX) || defined(SOLARIS) \
  	|| defined(LINUX) || defined(__GNU__) || defined(__GLIBC__) \
  	|| defined(FREEBSD) || defined(NETBSD) || defined(OPENBSD) \
  	|| defined(BSDI) || defined(NTO) || defined(DARWIN) \
  	|| defined(UNIXWARE) || defined(RISCOS) || defined(SYMBIAN)
  #define _PT_PTHREAD_YIELD()            	sched_yield()
  #else
  #error "Need to define _PT_PTHREAD_YIELD for this platform"
  #endif
  
  #endif /* nspr_pth_defs_h_ */
  