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63574f1275
The InnoDB source code contains quite a few references to a closed-source hot backup tool which was originally called InnoDB Hot Backup (ibbackup) and later incorporated in MySQL Enterprise Backup. The open source backup tool XtraBackup uses the full database for recovery. So, the references to UNIV_HOTBACKUP are only cluttering the source code.
282 lines
6.5 KiB
C++
282 lines
6.5 KiB
C++
/*****************************************************************************
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Copyright (c) 1995, 2016, Oracle and/or its affiliates. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/**************************************************//**
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@file os/os0thread.cc
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The interface to the operating system thread control primitives
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Created 9/8/1995 Heikki Tuuri
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*******************************************************/
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#include "ha_prototypes.h"
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#include "os0thread.h"
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#include "ut0new.h"
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#ifdef UNIV_NONINL
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#include "os0thread.ic"
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#endif
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#include "srv0srv.h"
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#include "os0event.h"
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#include <map>
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/** Mutex that tracks the thread count. Used by innorwlocktest.cc
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FIXME: the unit tests should use APIs */
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SysMutex thread_mutex;
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/** Number of threads active. */
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ulint os_thread_count;
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/***************************************************************//**
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Compares two thread ids for equality.
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@return TRUE if equal */
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ibool
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os_thread_eq(
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/*=========*/
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os_thread_id_t a, /*!< in: OS thread or thread id */
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os_thread_id_t b) /*!< in: OS thread or thread id */
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{
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#ifdef _WIN32
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if (a == b) {
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return(TRUE);
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}
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return(FALSE);
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#else
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if (pthread_equal(a, b)) {
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return(TRUE);
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}
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return(FALSE);
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#endif
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}
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/****************************************************************//**
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Converts an OS thread id to a ulint. It is NOT guaranteed that the ulint is
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unique for the thread though!
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@return thread identifier as a number */
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ulint
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os_thread_pf(
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/*=========*/
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os_thread_id_t a) /*!< in: OS thread identifier */
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{
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return((ulint) a);
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}
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/*****************************************************************//**
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Returns the thread identifier of current thread. Currently the thread
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identifier in Unix is the thread handle itself. Note that in HP-UX
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pthread_t is a struct of 3 fields.
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@return current thread identifier */
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os_thread_id_t
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os_thread_get_curr_id(void)
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/*=======================*/
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{
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#ifdef _WIN32
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return(GetCurrentThreadId());
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#else
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return(pthread_self());
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#endif
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}
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/****************************************************************//**
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Creates a new thread of execution. The execution starts from
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the function given.
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NOTE: We count the number of threads in os_thread_exit(). A created
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thread should always use that to exit so thatthe thread count will be
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decremented.
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We do not return an error code because if there is one, we crash here. */
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os_thread_t
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os_thread_create_func(
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/*==================*/
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os_thread_func_t func, /*!< in: pointer to function
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from which to start */
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void* arg, /*!< in: argument to start
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function */
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os_thread_id_t* thread_id) /*!< out: id of the created
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thread, or NULL */
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{
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os_thread_id_t new_thread_id;
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#ifdef _WIN32
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HANDLE handle;
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handle = CreateThread(NULL, /* no security attributes */
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0, /* default size stack */
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func,
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arg,
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0, /* thread runs immediately */
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&new_thread_id);
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if (!handle) {
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/* If we cannot start a new thread, life has no meaning. */
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ib::fatal() << "CreateThread returned " << GetLastError();
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}
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CloseHandle(handle);
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mutex_enter(&thread_mutex);
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os_thread_count++;
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mutex_exit(&thread_mutex);
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return((os_thread_t)new_thread_id);
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#else /* _WIN32 else */
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pthread_attr_t attr;
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pthread_attr_init(&attr);
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mutex_enter(&thread_mutex);
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++os_thread_count;
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mutex_exit(&thread_mutex);
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int ret = pthread_create(&new_thread_id, &attr, func, arg);
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ut_a(ret == 0);
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pthread_attr_destroy(&attr);
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#endif /* not _WIN32 */
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ut_a(os_thread_count <= OS_THREAD_MAX_N);
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/* Return the thread_id if the caller requests it. */
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if (thread_id != NULL) {
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*thread_id = new_thread_id;
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}
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return((os_thread_t)new_thread_id);
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}
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/** Exits the current thread. */
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void
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os_thread_exit()
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{
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#ifdef UNIV_DEBUG_THREAD_CREATION
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ib::info() << "Thread exits, id "
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<< os_thread_pf(os_thread_get_curr_id());
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#endif
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#ifdef UNIV_PFS_THREAD
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pfs_delete_thread();
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#endif
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mutex_enter(&thread_mutex);
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os_thread_count--;
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#ifdef _WIN32
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mutex_exit(&thread_mutex);
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ExitThread(0);
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#else
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mutex_exit(&thread_mutex);
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pthread_detach(pthread_self());
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pthread_exit(NULL);
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#endif
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}
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/*****************************************************************//**
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Advises the os to give up remainder of the thread's time slice. */
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void
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os_thread_yield(void)
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/*=================*/
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{
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#if defined(_WIN32)
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SwitchToThread();
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#else
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sched_yield();
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#endif
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}
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/*****************************************************************//**
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The thread sleeps at least the time given in microseconds. */
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void
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os_thread_sleep(
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/*============*/
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ulint tm) /*!< in: time in microseconds */
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{
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#ifdef _WIN32
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Sleep((DWORD) tm / 1000);
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#elif defined(HAVE_NANOSLEEP)
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struct timespec t;
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t.tv_sec = tm / 1000000;
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t.tv_nsec = (tm % 1000000) * 1000;
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::nanosleep(&t, NULL);
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#else
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struct timeval t;
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t.tv_sec = tm / 1000000;
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t.tv_usec = tm % 1000000;
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select(0, NULL, NULL, NULL, &t);
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#endif /* _WIN32 */
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}
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/*****************************************************************//**
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Check if there are threads active.
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@return true if the thread count > 0. */
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bool
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os_thread_active()
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/*==============*/
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{
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mutex_enter(&thread_mutex);
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bool active = (os_thread_count > 0);
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/* All the threads have exited or are just exiting;
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NOTE that the threads may not have completed their
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exit yet. Should we use pthread_join() to make sure
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they have exited? If we did, we would have to
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remove the pthread_detach() from
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os_thread_exit(). Now we just sleep 0.1
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seconds and hope that is enough! */
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mutex_exit(&thread_mutex);
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return(active);
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}
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/**
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Initializes OS thread management data structures. */
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void
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os_thread_init()
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/*============*/
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{
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mutex_create(LATCH_ID_THREAD_MUTEX, &thread_mutex);
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}
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/**
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Frees OS thread management data structures. */
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void
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os_thread_free()
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/*============*/
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{
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if (os_thread_count != 0) {
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ib::warn() << "Some (" << os_thread_count << ") threads are"
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" still active";
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}
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mutex_destroy(&thread_mutex);
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}
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