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/*-
* Copyright (c) 2014-2019 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __wt_thread_create --
* Create a new thread of control.
*/
int
__wt_thread_create(WT_SESSION_IMPL *session, wt_thread_t *tidret,
WT_THREAD_CALLBACK (*func)(void *), void *arg) WT_GCC_FUNC_ATTRIBUTE((visibility("default")))
{
WT_DECL_RET;
/*
* Creating a thread isn't a memory barrier, but WiredTiger commonly sets flags and or state and
* then expects worker threads to start. Include a barrier to ensure safety in those cases.
*/
WT_FULL_BARRIER();
/* Spawn a new thread of control. */
WT_SYSCALL_RETRY(pthread_create(&tidret->id, NULL, func, arg), ret);
if (ret == 0) {
tidret->created = true;
return (0);
}
WT_RET_MSG(session, ret, "pthread_create");
}
/*
* __wt_thread_join --
* Wait for a thread of control to exit.
*/
int
__wt_thread_join(WT_SESSION_IMPL *session, wt_thread_t *tid)
WT_GCC_FUNC_ATTRIBUTE((visibility("default")))
{
WT_DECL_RET;
/* Only attempt to join if thread was created successfully */
if (!tid->created)
return (0);
tid->created = false;
/*
* Joining a thread isn't a memory barrier, but WiredTiger commonly sets flags and or state and
* then expects worker threads to halt. Include a barrier to ensure safety in those cases.
*/
WT_FULL_BARRIER();
WT_SYSCALL(pthread_join(tid->id, NULL), ret);
if (ret == 0)
return (0);
WT_RET_MSG(session, ret, "pthread_join");
}
/*
* __wt_thread_id --
* Return an arithmetic representation of a thread ID on POSIX.
*/
void
__wt_thread_id(uintmax_t *id) WT_GCC_FUNC_ATTRIBUTE((visibility("default")))
{
pthread_t self;
/*
* POSIX 1003.1 allows pthread_t to be an opaque type; on systems where it's a pointer, print
* the pointer to match gdb output.
*/
self = pthread_self();
#ifdef __sun
*id = (uintmax_t)self;
#else
*id = (uintmax_t)(void *)self;
#endif
}
/*
* __wt_thread_str --
* Fill in a printable version of the process and thread IDs.
*/
int
__wt_thread_str(char *buf, size_t buflen) WT_GCC_FUNC_ATTRIBUTE((visibility("default")))
{
pthread_t self;
/*
* POSIX 1003.1 allows pthread_t to be an opaque type; on systems where it's a pointer, print
* the pointer to match gdb output.
*/
self = pthread_self();
#ifdef __sun
return (__wt_snprintf(buf, buflen, "%" PRIuMAX ":%u", (uintmax_t)getpid(), self));
#else
return (__wt_snprintf(buf, buflen, "%" PRIuMAX ":%p", (uintmax_t)getpid(), (void *)self));
#endif
}
/*
* __wt_process_id --
* Return the process ID assigned by the operating system.
*/
uintmax_t
__wt_process_id(void)
{
return ((uintmax_t)getpid());
}
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