_pth.h (6351B)
1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* This Source Code Form is subject to the terms of the Mozilla Public 3 * License, v. 2.0. If a copy of the MPL was not distributed with this 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 5 6 #ifndef nspr_pth_defs_h_ 7 #define nspr_pth_defs_h_ 8 9 /* 10 ** Appropriate definitions of entry points not used in a pthreads world 11 */ 12 #define _PR_MD_BLOCK_CLOCK_INTERRUPTS() 13 #define _PR_MD_UNBLOCK_CLOCK_INTERRUPTS() 14 #define _PR_MD_DISABLE_CLOCK_INTERRUPTS() 15 #define _PR_MD_ENABLE_CLOCK_INTERRUPTS() 16 17 #define _PT_PTHREAD_MUTEXATTR_INIT pthread_mutexattr_init 18 #define _PT_PTHREAD_MUTEXATTR_DESTROY pthread_mutexattr_destroy 19 #define _PT_PTHREAD_MUTEX_INIT(m, a) pthread_mutex_init(&(m), &(a)) 20 #if defined(FREEBSD) 21 #define _PT_PTHREAD_MUTEX_IS_LOCKED(m) pt_pthread_mutex_is_locked(&(m)) 22 #else 23 #define _PT_PTHREAD_MUTEX_IS_LOCKED(m) (EBUSY == pthread_mutex_trylock(&(m))) 24 #endif 25 #if defined(ANDROID) 26 /* Conditional attribute init and destroy aren't implemented in bionic. */ 27 #define _PT_PTHREAD_CONDATTR_INIT(x) 0 28 #define _PT_PTHREAD_CONDATTR_DESTROY(x) /* */ 29 #else 30 #define _PT_PTHREAD_CONDATTR_INIT pthread_condattr_init 31 #define _PT_PTHREAD_CONDATTR_DESTROY pthread_condattr_destroy 32 #endif 33 #define _PT_PTHREAD_COND_INIT(m, a) pthread_cond_init(&(m), &(a)) 34 35 /* The pthreads standard does not specify an invalid value for the 36 * pthread_t handle. (0 is usually an invalid pthread identifier 37 * but there are exceptions, for example, DG/UX.) These macros 38 * define a way to set the handle to or compare the handle with an 39 * invalid identifier. These macros are not portable and may be 40 * more of a problem as we adapt to more pthreads implementations. 41 * They are only used in the PRMonitor functions. Do not use them 42 * in new code. 43 * 44 * Unfortunately some of our clients depend on certain properties 45 * of our PRMonitor implementation, preventing us from replacing 46 * it by a portable implementation. 47 * - High-performance servers like the fact that PR_EnterMonitor 48 * only calls PR_Lock and PR_ExitMonitor only calls PR_Unlock. 49 * (A portable implementation would use a PRLock and a PRCondVar 50 * to implement the recursive lock in a monitor and call both 51 * PR_Lock and PR_Unlock in PR_EnterMonitor and PR_ExitMonitor.) 52 * Unfortunately this forces us to read the monitor owner field 53 * without holding a lock. 54 * - One way to make it safe to read the monitor owner field 55 * without holding a lock is to make that field a PRThread* 56 * (one should be able to read a pointer with a single machine 57 * instruction). However, PR_GetCurrentThread calls calloc if 58 * it is called by a thread that was not created by NSPR. The 59 * malloc tracing tools in the Mozilla client use PRMonitor for 60 * locking in their malloc, calloc, and free functions. If 61 * PR_EnterMonitor calls any of these functions, infinite 62 * recursion ensues. 63 */ 64 #if defined(AIX) || defined(SOLARIS) \ 65 || defined(LINUX) || defined(__GNU__) || defined(__GLIBC__) \ 66 || defined(FREEBSD) || defined(NETBSD) || defined(OPENBSD) \ 67 || defined(NTO) || defined(DARWIN) \ 68 || defined(RISCOS) 69 #define _PT_PTHREAD_INVALIDATE_THR_HANDLE(t) (t) = 0 70 #define _PT_PTHREAD_THR_HANDLE_IS_INVALID(t) (t) == 0 71 #define _PT_PTHREAD_COPY_THR_HANDLE(st, dt) (dt) = (st) 72 #else 73 #error "pthreads is not supported for this architecture" 74 #endif 75 76 #if defined(_PR_PTHREADS) 77 #define _PT_PTHREAD_ATTR_INIT pthread_attr_init 78 #define _PT_PTHREAD_ATTR_DESTROY pthread_attr_destroy 79 #define _PT_PTHREAD_CREATE(t, a, f, r) pthread_create(t, &a, f, r) 80 #define _PT_PTHREAD_KEY_CREATE pthread_key_create 81 #define _PT_PTHREAD_ATTR_SETSCHEDPOLICY pthread_attr_setschedpolicy 82 #define _PT_PTHREAD_ATTR_GETSTACKSIZE(a, s) pthread_attr_getstacksize(a, s) 83 #define _PT_PTHREAD_GETSPECIFIC(k, r) (r) = pthread_getspecific(k) 84 #else 85 #error "Cannot determine pthread strategy" 86 #endif 87 88 /* 89 * These platforms don't have sigtimedwait() 90 */ 91 #if (defined(AIX) && !defined(AIX4_3_PLUS)) \ 92 || defined(LINUX) || defined(__GNU__)|| defined(__GLIBC__) \ 93 || defined(FREEBSD) || defined(NETBSD) || defined(OPENBSD) \ 94 || defined(DARWIN) 95 #define PT_NO_SIGTIMEDWAIT 96 #endif 97 98 #if defined(AIX) 99 #include <sys/priv.h> 100 #include <sys/sched.h> 101 #ifndef PTHREAD_CREATE_JOINABLE 102 #define PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED 103 #endif 104 #define PT_PRIO_MIN DEFAULT_PRIO 105 #define PT_PRIO_MAX DEFAULT_PRIO 106 #elif defined(LINUX) || defined(__GNU__) || defined(__GLIBC__) \ 107 || defined(FREEBSD) 108 #define PT_PRIO_MIN sched_get_priority_min(SCHED_OTHER) 109 #define PT_PRIO_MAX sched_get_priority_max(SCHED_OTHER) 110 #elif defined(NTO) 111 /* 112 * Neutrino has functions that return the priority range but 113 * they return invalid numbers, so I just hard coded these here 114 * for now. Jerry.Kirk@Nexarecorp.com 115 */ 116 #define PT_PRIO_MIN 0 117 #define PT_PRIO_MAX 30 118 #elif defined(SOLARIS) 119 /* 120 * Solaris doesn't seem to have macros for the min/max priorities. 121 * The range of 0-127 is mentioned in the pthread_setschedparam(3T) 122 * man pages, and pthread_setschedparam indeed allows 0-127. However, 123 * pthread_attr_setschedparam does not allow 0; it allows 1-127. 124 */ 125 #define PT_PRIO_MIN 1 126 #define PT_PRIO_MAX 127 127 #elif defined(OPENBSD) 128 #define PT_PRIO_MIN 0 129 #define PT_PRIO_MAX 31 130 #elif defined(NETBSD) \ 131 || defined(DARWIN) \ 132 || defined(RISCOS) /* XXX */ 133 #define PT_PRIO_MIN 0 134 #define PT_PRIO_MAX 126 135 #else 136 #error "pthreads is not supported for this architecture" 137 #endif 138 139 /* 140 * The _PT_PTHREAD_YIELD function is called from a signal handler. 141 * Needed for garbage collection -- Look at PR_Suspend/PR_Resume 142 * implementation. 143 */ 144 #if defined(AIX) 145 extern int (*_PT_aix_yield_fcn)(); 146 #define _PT_PTHREAD_YIELD() (*_PT_aix_yield_fcn)() 147 #elif defined(SOLARIS) \ 148 || defined(LINUX) || defined(__GNU__) || defined(__GLIBC__) \ 149 || defined(FREEBSD) || defined(NETBSD) || defined(OPENBSD) \ 150 || defined(NTO) || defined(DARWIN) \ 151 || defined(RISCOS) 152 #define _PT_PTHREAD_YIELD() sched_yield() 153 #else 154 #error "Need to define _PT_PTHREAD_YIELD for this platform" 155 #endif 156 157 #endif /* nspr_pth_defs_h_ */