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_pth.h
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_pth.h
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#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)
#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_ */