| /** @file |
| |
| A brief file description |
| |
| @section license License |
| |
| Licensed to the Apache Software Foundation (ASF) under one |
| or more contributor license agreements. See the NOTICE file |
| distributed with this work for additional information |
| regarding copyright ownership. The ASF licenses this file |
| to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| */ |
| |
| /************************************************************************** |
| |
| ink_thread.cc |
| |
| Generic threads interface. |
| **************************************************************************/ |
| |
| #include "tscore/ink_platform.h" |
| #include "tscore/ink_thread.h" |
| #include "tscore/ink_atomic.h" |
| |
| // // ignore the compiler warning... so that this can be used |
| // // in the face of changes to the Solaris header files (see "man thread") |
| // |
| // ink_mutex ink_mutex_initializer = INK_MUTEX_INIT; |
| // |
| // Put a bracketed initializer in ink_thread.h --- 9/19/96, bri |
| ink_mutex ink_mutex_initializer = INK_MUTEX_INIT; |
| |
| #if TS_EMULATE_ANON_SEMAPHORES |
| static int64_t ink_semaphore_count = 0; |
| #endif |
| |
| void |
| ink_sem_init(ink_semaphore *sp, unsigned int count) |
| { |
| // Darwin has sem_open, but not sem_init. We emulate sem_init with sem_open. |
| #if TS_EMULATE_ANON_SEMAPHORES |
| char sname[NAME_MAX]; |
| |
| sp->semid = ink_atomic_increment(&ink_semaphore_count, 1); |
| snprintf(sname, sizeof(sname), "/trafficserver/anon/%" PRId64, sp->semid); |
| |
| ink_assert((sp->sema = sem_open(sname, O_CREAT | O_EXCL, 0770, count)) != SEM_FAILED); |
| |
| // Since we are emulating anonymous semaphores, unlink the name |
| // so no other process can accidentally get it. |
| ink_assert(sem_unlink(sname) != -1); |
| #else |
| ink_assert(sem_init(sp->get(), 0 /* pshared */, count) != -1); |
| #endif |
| } |
| |
| void |
| ink_sem_destroy(ink_semaphore *sp) |
| { |
| #if TS_EMULATE_ANON_SEMAPHORES |
| ink_assert(sem_close(sp->get()) != -1); |
| #else |
| ink_assert(sem_destroy(sp->get()) != -1); |
| #endif |
| } |
| |
| void |
| ink_sem_wait(ink_semaphore *sp) |
| { |
| int r; |
| while (EINTR == (r = sem_wait(sp->get()))) { |
| ; |
| } |
| ink_assert(!r); |
| } |
| |
| bool |
| ink_sem_trywait(ink_semaphore *sp) |
| { |
| int r; |
| while (EINTR == (r = sem_trywait(sp->get()))) { |
| ; |
| } |
| ink_assert(r == 0 || (errno == EAGAIN)); |
| return r == 0; |
| } |
| |
| void |
| ink_sem_post(ink_semaphore *sp) |
| { |
| ink_assert(sem_post(sp->get()) != -1); |
| } |