diff options
Diffstat (limited to 'nsprpub/pr/include/md/_pth.h')
| -rw-r--r-- | nsprpub/pr/include/md/_pth.h | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/nsprpub/pr/include/md/_pth.h b/nsprpub/pr/include/md/_pth.h new file mode 100644 index 000000000..eeeef0438 --- /dev/null +++ b/nsprpub/pr/include/md/_pth.h @@ -0,0 +1,270 @@ +/* -*- 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_ */ |