/* BEGIN_ICS_COPYRIGHT5 ****************************************
Copyright (c) 2015-2020, Intel Corporation
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
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documentation and/or other materials provided with the distribution.
* Neither the name of Intel Corporation nor the names of its contributors
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* ** END_ICS_COPYRIGHT5 ****************************************/
/***********************************************************************
*
* FILE NAME
* vs_lck.c
*
* DESCRIPTION
* This file contains the Linux User implementation of the vs_lock
* services.
*
* DATA STRUCTURES
*
* FUNCTIONS
* vs_lock_init
* vs_lock_delete
* vs_lock
* vs_unlock
* vs_spinlock
* vs_spinunlock
*
* DEPENDENCIES
* vs_g.h
* cs_g.h
* cs_log.h
*
*
* HISTORY
*
* NAME DATE REMARKS
* MGR 03/01/02 Initial creation of file.
* MGR 03/13/02 Added spinlock recursion support.
* MGR 03/21/02 Added fix for bug, where only one thread waiting
* on the thread lock was woken when lock was deleted.
* MGR 03/26/02 Corrected lint errors.
* MGR 04/04/02 PR1676. Rev G, CS API required changes.
* MGR 04/10/02 PR1716. Fixed spinlocks to block until freed by
* the owning thread.
* MGR 05/13/02 PR1812. Clean-up lint errors/warnings.
*
***********************************************************************/
#ifdef BUILD_RHEL4
#define _POSIX_C_SOURCE 200112L
#endif
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <pthread.h>
#include "ib_types.h"
#include "ib_status.h"
#include "vs_g.h"
#include "cs_g.h"
#include "cs_log.h"
#ifdef LOCAL_MOD_ID
#undef LOCAL_MOD_ID
#endif
#define LOCAL_MOD_ID VIEO_CS_MOD_ID
/*
#include <vsdd.h>
*/
#include <sys/ioctl.h>
#include "iba/public/ispinlock.h"
/*
** Implementation private data structure
*/
typedef struct
{
uint8_t name[VS_NAME_MAX];
union {
struct { // for THREAD
pthread_mutex_t mutex;
} lock;
struct { // for RWTHREAD
pthread_rwlock_t rwlock;
ATOMIC_UINT reader_count;
} rwlock;
struct { // for recursive SPIN
pthread_mutex_t mutex;
pthread_cond_t cond;
Threadname_t owner_thread;
uint32_t spin_count;
} spin;
} u;
} Implpriv_Lock_t;
/**********************************************************************
*
* FUNCTION
* vs_lock_init
*
* DESCRIPTION
* Initialize a thread or spin lock.
*
* INPUTS
* handle - A pointer to a lock control block.
* state - The initial state of the lock, VLOCK_LOCKED or VLOCK_FREE.
* type - type of lock to create, VLOCK_SPIN, VLOCK_THREAD, VLOCK_RWTHREAD
*
* OUTPUTS
* Status_t - On success VSTATUS_OK is returned, otherwise
* the cause of the error.
*
*
* HISTORY
*
* NAME DATE REMARKS
* MGR 03/01/02 Initial creation of function.
* MGR 03/13/02 Added spinlock recursion support.
* MGR 04/04/02 PR1676. Rev G, CS API required changes.
*
**********************************************************************/
Status_t
vs_lock_init (Lock_t *handle,
unsigned int state,
unsigned int type)
{
Status_t rc;
Implpriv_Lock_t *implpriv;
static const char function[] = "vs_lock_init";
IB_ENTER (function,
(unint)handle,
(uint32_t)state,
(uint32_t)type,
(uint32_t)0U);
/*
** Validate parameters
*/
if (handle == NULL)
{
IB_LOG_ERROR0 ("NULL handle pointer");
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
if ((state != VLOCK_LOCKED) && (state != VLOCK_FREE))
{
IB_LOG_ERROR ("invalid state:", state);
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
if ((type != VLOCK_SPIN) && (type != VLOCK_THREAD)
&& (type != VLOCK_RWTHREAD))
{
IB_LOG_ERROR ("invalid type:", type);
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
/*
** Ensure opaque section of Lock_t is large enough to
** contain the Implementation private data structure.
*/
if ((sizeof(Implpriv_Lock_t)) > (sizeof(handle->opaque)))
{
IB_LOG_ERROR("Implpriv_Lock_t too large:", (sizeof(Implpriv_Lock_t)));
IB_FATAL_ERROR_NODUMP("Implpriv_Lock_t too large");
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
/*
** Do initial setup
*/
// TBD - can we drop implpriv part for vs_lock and simply declare
// an OS specific Lock_t
memset ((void *)handle, 0, sizeof(Lock_t));
implpriv = (Implpriv_Lock_t *)handle->opaque;
memcpy ((void *)implpriv->name, "VIEO_lock", 9);
if (type == VLOCK_THREAD)
{
/* setup thread lock */
if (pthread_mutex_init (&implpriv->u.lock.mutex, NULL) != 0)
{
IB_LOG_ERROR0 ("Unable to initialize lock");
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
handle->type = VLOCK_THREAD;
handle->magic = VLOCK_THREADLOCK_MAGIC;
if (state == VLOCK_LOCKED)
{
(void)pthread_mutex_lock (&implpriv->u.lock.mutex);
handle->status = VLOCK_LOCKED;
}
else
{
handle->status = VLOCK_FREE;
}
}
else if (type == VLOCK_RWTHREAD)
{
/* setup RW thread lock */
if (pthread_rwlock_init (&implpriv->u.rwlock.rwlock, NULL) != 0)
{
IB_LOG_ERROR0 ("Unable to initialize lock");
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
handle->status = VLOCK_FREE;
AtomicWrite(&implpriv->u.rwlock.reader_count, 0);
if (state == VLOCK_LOCKED)
{
pthread_rwlock_wrlock(&implpriv->u.rwlock.rwlock);
handle->status = VLOCK_LOCKED;
}
handle->type = VLOCK_RWTHREAD;
handle->magic = VLOCK_RWTHREADLOCK_MAGIC;
}
else
{
/* setup spinlock */
if (pthread_mutex_init (&implpriv->u.spin.mutex, NULL) != 0)
{
IB_LOG_ERROR0 ("Unable to initialize lock");
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
(void)pthread_mutex_lock (&implpriv->u.spin.mutex);
(void)pthread_cond_init (&implpriv->u.spin.cond, NULL);
handle->status = VLOCK_FREE;
/* initialize count and owner thread */
implpriv->u.spin.spin_count = 0;
implpriv->u.spin.owner_thread = (uint64_t)0ULL;
if (state == VLOCK_LOCKED)
{
/* set the lock to show in-use */
implpriv->u.spin.spin_count++;
handle->status = VLOCK_LOCKED;
/* set the thread name */
rc = vs_thread_name (&implpriv->u.spin.owner_thread);
if (rc != VSTATUS_OK)
{
IB_LOG_ERROR0 ("Unable to set owner_thread");
}
else
{
//IB_LOG_INFO ("owner_thread", (uint32_t)implpriv->owner_thread);
}
}
//IB_LOG_INFO ("implpriv->spin_count =", implpriv->spin_count);
handle->type = VLOCK_SPIN;
handle->magic = VLOCK_SPINLOCK_MAGIC;
(void)pthread_mutex_unlock (&implpriv->u.spin.mutex);
}
//IB_LOG_INFO ("handle->type =", handle->type);
//IB_LOG_INFO ("handle->status =", handle->status);
//IB_LOG_INFO ("handle->magic =", handle->magic);
IB_EXIT (function, VSTATUS_OK);
return VSTATUS_OK;
}
/**********************************************************************
*
* FUNCTION
* vs_lock_delete
*
* DESCRIPTION
* Delete a lock previously initialized with vs_lock_init().
*
* INPUTS
* handle - A pointer to the lock control block filled in by
* the vs_lock_init() call.
*
* OUTPUTS
* Status_t - On success VSTATUS_OK is returned, otherwise
* the cause of the error.
*
*
* HISTORY
*
* NAME DATE REMARKS
* MGR 03/01/02 Initial creation of function.
*
**********************************************************************/
Status_t
vs_lock_delete (Lock_t *handle)
{
Implpriv_Lock_t *implpriv;
static const char function[] = "vs_lock_delete";
IB_ENTER (function,
(unint)handle,
(uint32_t)0U,
(uint32_t)0U,
(uint32_t)0U);
/*
** Validate handle
*/
if (handle == NULL)
{
IB_LOG_ERROR0 ("NULL handle pointer");
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
if (handle->type != VLOCK_THREAD && handle->type != VLOCK_RWTHREAD &&
handle->type != VLOCK_SPIN)
{
IB_LOG_INFINI_INFO ("Lock type is not thread lock or spinlock type:", handle->type);
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
if (handle->magic != VLOCK_THREADLOCK_MAGIC &&
handle->magic != VLOCK_RWTHREADLOCK_MAGIC &&
handle->magic != VLOCK_SPINLOCK_MAGIC)
{
IB_LOG_ERRORX ("Lock does not exist magic:", handle->magic);
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
/*
** Delete/Invalidate the lock
*/
implpriv = (Implpriv_Lock_t *)handle->opaque;
if (handle->type == VLOCK_RWTHREAD) {
// getting the lock here is a bit of a hack to limit shutdown sequencing
// problems
vs_wrlock(handle);
handle->type = 0xFFFFFFFF;
handle->status = 0xFFFFFFFF;
handle->magic = 0;
// pthread_rwlock_destroy (&implpriv->u.rwlock.rwlock); // TBD paranoia
} else if (handle->type == VLOCK_THREAD) {
(void)pthread_mutex_lock (&implpriv->u.lock.mutex);
handle->type = 0xFFFFFFFF;
handle->status = 0xFFFFFFFF;
handle->magic = 0;
(void)pthread_mutex_unlock (&implpriv->u.lock.mutex);
/* pthread_mutex_destroy (&implpriv->u.lock.mutex); tmp */
} else { // SPIN
(void)pthread_mutex_lock (&implpriv->u.spin.mutex);
handle->type = 0xFFFFFFFF;
handle->status = 0xFFFFFFFF;
handle->magic = 0;
/*
** Awaken all sleeping threads
*/
//IB_LOG_INFO0 ("waking threads waiting on lock");
(void)pthread_cond_broadcast (&implpriv->u.spin.cond);
(void)pthread_mutex_unlock (&implpriv->u.spin.mutex);
/* pthread_mutex_destroy (&implpriv->u.spin.mutex); tmp */
}
IB_EXIT (function, VSTATUS_OK);
return VSTATUS_OK;
}
/**********************************************************************
*
* FUNCTION
* vs_lock
*
* DESCRIPTION
* Acquire a thread lock.
*
* INPUTS
* handle - A pointer to the thread lock control object filled in
* by vs_lock_init().
*
* OUTPUTS
* Status_t - On success VSTATUS_OK is returned, otherwise
* the cause of the error.
*
* NOTES
* * handle->status is only maintained for debug asserts, as we
* rely directly on pthreads for locking state.
* * vs_lock_delete can not call pthread_mutex_destroy, as the mutex
* is intended to remain valid in order to handle racing locks and
* deletes (themselves a sign that we need to cleanup shutdown
* logic, as this case should be undefined).
*
* HISTORY
*
* NAME DATE REMARKS
* MGR 03/01/02 Initial creation of function.
* MGR 03/21/02 Added fix for bug, where only one thread waiting
* on the thread lock was woken when lock was deleted.
*
**********************************************************************/
Status_t
vs_lock (Lock_t *handle)
{
Implpriv_Lock_t *implpriv;
static const char function[] = "vs_lock";
IB_ENTER (function,
(unint)handle,
(uint32_t)0U,
(uint32_t)0U,
(uint32_t)0U);
/*
** Validate handle
*/
if (handle == NULL)
{
IB_LOG_ERROR0 ("NULL handle pointer");
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
if (handle->type == VLOCK_RWTHREAD)
return vs_wrlock(handle); // safety valve in case wrong call used
if (handle->type != VLOCK_THREAD)
{
IB_LOG_ERROR ("Lock type is not thread lock type:", handle->type);
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
if (handle->magic != VLOCK_THREADLOCK_MAGIC)
{
IB_LOG_ERRORX("Lock does not exist magic:", handle->magic);
IB_EXIT(function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
/*
** Lock the lock
*/
implpriv = (Implpriv_Lock_t *)handle->opaque;
(void)pthread_mutex_lock (&implpriv->u.lock.mutex);
if (handle->magic != VLOCK_THREADLOCK_MAGIC)
{
(void)pthread_mutex_unlock(&implpriv->u.lock.mutex);
IB_LOG_ERRORX("Lock deleted during acquisition attempt magic:", handle->magic);
IB_EXIT(function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
DEBUG_ASSERT(handle->status == VLOCK_FREE);
handle->status = VLOCK_LOCKED;
IB_EXIT (function, VSTATUS_OK);
return VSTATUS_OK;
}
/**********************************************************************
*
* FUNCTION
* vs_unlock
*
* DESCRIPTION
* Release the thread lock associated with the handle.
*
* INPUTS
* handle - A pointer to a thread lock control object filled in
* by vs_lock_init().
*
* OUTPUTS
* Status_t - On success VSTATUS_OK is returned, otherwise
* the cause of the error.
*
*
* HISTORY
*
* NAME DATE REMARKS
* MGR 03/01/02 Initial creation of function.
*
**********************************************************************/
Status_t
vs_unlock (Lock_t *handle)
{
Implpriv_Lock_t *implpriv;
static const char function[] = "vs_unlock";
IB_ENTER (function,
(unint)handle,
(uint32_t)0U,
(uint32_t)0U,
(uint32_t)0U);
/*
** Validate handle
*/
if (handle == NULL)
{
IB_LOG_ERROR0 ("NULL handle pointer");
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
if (handle->type == VLOCK_RWTHREAD)
return vs_rwunlock(handle); // safety valve in case wrong call used
if (handle->type != VLOCK_THREAD)
{
IB_LOG_ERROR ("Lock type is not thread lock type:", handle->type);
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
if (handle->magic != VLOCK_THREADLOCK_MAGIC)
{
IB_LOG_ERRORX ("Lock does not exist magic:", handle->magic);
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
/*
** Unlock the lock
*/
implpriv = (Implpriv_Lock_t *)handle->opaque;
DEBUG_ASSERT(handle->status == VLOCK_LOCKED);
handle->status = VLOCK_FREE;
(void)pthread_mutex_unlock (&implpriv->u.lock.mutex);
IB_EXIT (function, VSTATUS_OK);
return VSTATUS_OK;
}
/**********************************************************************
*
* FUNCTION
* vs_wrlock
*
* DESCRIPTION
* Acquire a rw thread lock.
*
* INPUTS
* handle - A pointer to the rw thread lock control object filled in
* by vs_lock_init().
*
* OUTPUTS
* Status_t - On success VSTATUS_OK is returned, otherwise
* the cause of the error.
*
* HISTORY
*
* NAME DATE REMARKS
*
**********************************************************************/
Status_t
vs_wrlock (Lock_t *handle)
{
Implpriv_Lock_t *implpriv;
static const char function[] = "vs_wrlock";
IB_ENTER (function,
(unint)handle,
(uint32_t)0U,
(uint32_t)0U,
(uint32_t)0U);
/*
** Validate handle
*/
if (handle == NULL)
{
IB_LOG_ERROR0 ("NULL handle pointer");
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
if (handle->type != VLOCK_RWTHREAD)
{
IB_LOG_ERROR ("Lock type is not rw thread lock type:", handle->type);
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
if (handle->magic != VLOCK_RWTHREADLOCK_MAGIC)
{
IB_LOG_ERRORX ("Lock does not exist magic:", handle->magic);
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
/*
** Lock the lock
*/
implpriv = (Implpriv_Lock_t *)handle->opaque;
pthread_rwlock_wrlock(&implpriv->u.rwlock.rwlock);
handle->status = VLOCK_LOCKED;
DEBUG_ASSERT(0 == AtomicRead(&implpriv->u.rwlock.reader_count));
IB_EXIT (function, VSTATUS_OK);
return VSTATUS_OK;
}
/**********************************************************************
*
* FUNCTION
* vs_rdlock
*
* DESCRIPTION
* Acquire a rw thread lock.
*
* INPUTS
* handle - A pointer to the rw thread lock control object filled in
* by vs_lock_init().
*
* OUTPUTS
* Status_t - On success VSTATUS_OK is returned, otherwise
* the cause of the error.
*
* HISTORY
*
* NAME DATE REMARKS
*
**********************************************************************/
Status_t
vs_rdlock (Lock_t *handle)
{
Implpriv_Lock_t *implpriv;
static const char function[] = "vs_rdlock";
IB_ENTER (function,
(unint)handle,
(uint32_t)0U,
(uint32_t)0U,
(uint32_t)0U);
/*
** Validate handle
*/
if (handle == NULL)
{
IB_LOG_ERROR0 ("NULL handle pointer");
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
if (handle->type != VLOCK_RWTHREAD)
{
IB_LOG_ERROR ("Lock type is not rw thread lock type:", handle->type);
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
if (handle->magic != VLOCK_RWTHREADLOCK_MAGIC)
{
IB_LOG_ERRORX ("Lock does not exist magic:", handle->magic);
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
/*
** Lock the lock
*/
implpriv = (Implpriv_Lock_t *)handle->opaque;
pthread_rwlock_rdlock(&implpriv->u.rwlock.rwlock);
AtomicIncrementVoid(&implpriv->u.rwlock.reader_count);
DEBUG_ASSERT(handle->status != VLOCK_LOCKED);
IB_EXIT (function, VSTATUS_OK);
return VSTATUS_OK;
}
/**********************************************************************
*
* FUNCTION
* vs_rwunlock
*
* DESCRIPTION
* Release the rw thread lock associated with the handle.
*
* INPUTS
* handle - A pointer to a rw thread lock control object filled in
* by vs_lock_init().
*
* OUTPUTS
* Status_t - On success VSTATUS_OK is returned, otherwise
* the cause of the error.
*
*
* HISTORY
*
* NAME DATE REMARKS
* MGR 03/01/02 Initial creation of function.
*
**********************************************************************/
Status_t
vs_rwunlock (Lock_t *handle)
{
Implpriv_Lock_t *implpriv;
static const char function[] = "vs_rwunlock";
IB_ENTER (function,
(unint)handle,
(uint32_t)0U,
(uint32_t)0U,
(uint32_t)0U);
/*
** Validate handle
*/
if (handle == NULL)
{
IB_LOG_ERROR0 ("NULL handle pointer");
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
if (handle->type != VLOCK_RWTHREAD)
{
IB_LOG_ERROR ("Lock type is not rw thread lock type:", handle->type);
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
if (handle->magic != VLOCK_RWTHREADLOCK_MAGIC)
{
IB_LOG_ERRORX ("Lock does not exist magic:", handle->magic);
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
/*
** Unlock the lock
*/
implpriv = (Implpriv_Lock_t *)handle->opaque;
if (handle->status == VLOCK_FREE) {
// we must have a rdlock
DEBUG_ASSERT(0 != AtomicRead(&implpriv->u.rwlock.reader_count));
AtomicDecrementVoid(&implpriv->u.rwlock.reader_count);
(void)pthread_rwlock_unlock (&implpriv->u.rwlock.rwlock);
} else {
// we must have a wrlock
DEBUG_ASSERT(0 == AtomicRead(&implpriv->u.rwlock.reader_count));
handle->status = VLOCK_FREE;
(void)pthread_rwlock_unlock (&implpriv->u.rwlock.rwlock);
}
//IB_LOG_INFO ("handle->status =", handle->status);
IB_EXIT (function, VSTATUS_OK);
return VSTATUS_OK;
}
// TBD - this is nice, supports recursive locks
// but its not implemented for vxWorks and is not used
// perhaps delete.
// Also thread_mutex allows a PTHREAD_MUTEX_RECURSIVE option
/**********************************************************************
*
* FUNCTION
* vs_spinlock
*
* DESCRIPTION
* Acquire a spin lock.
*
* INPUTS
* handle - A pointer to the spin lock control object filled in
* by vs_lock_init().
*
* OUTPUTS
* Status_t - On success VSTATUS_OK is returned, otherwise
* the cause of the error.
*
*
* HISTORY
*
* NAME DATE REMARKS
* MGR 03/01/02 Initial creation of function.
* MGR 03/13/02 Added recursion support.
* MGR 04/10/02 PR1716. Block until spinlock is freed by owner,
* either via vs_spinunlock or vs_lock_delete.
*
**********************************************************************/
Status_t
vs_spinlock (Lock_t *handle)
{
uint32_t wake_me_up = 0;
Status_t rc;
Implpriv_Lock_t *implpriv;
Threadname_t current_thread_name;
static const char function[] = "vs_spinlock";
IB_ENTER (function,
(unint)handle,
(uint32_t)0U,
(uint32_t)0U,
(uint32_t)0U);
/*
** Validate handle
*/
if (handle == NULL)
{
IB_LOG_ERROR0 ("NULL handle pointer");
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
if (handle->type != VLOCK_SPIN)
{
IB_LOG_ERROR ("Lock type is not spinlock type:", handle->type);
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
if (handle->magic != VLOCK_SPINLOCK_MAGIC)
{
IB_LOG_ERRORX ("Lock does not exist magic:", handle->magic);
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
/*
** Lock the lock
*/
implpriv = (Implpriv_Lock_t *)handle->opaque;
(void)pthread_mutex_lock (&implpriv->u.spin.mutex);
if (handle->status == VLOCK_LOCKED)
{
//IB_LOG_INFO ("lock is currently locked", handle->status);
/*
** Get current thread name
*/
rc = vs_thread_name (¤t_thread_name);
if (rc != VSTATUS_OK)
{
IB_LOG_ERRORRC("vs_thread_name error rc:", rc);
(void)pthread_mutex_unlock (&implpriv->u.spin.mutex);
IB_EXIT (function, VSTATUS_NXIO);
return VSTATUS_NXIO;
}
//IB_LOG_INFO ("thread owning lock", (uint32_t)implpriv->u.spin.owner_thread);
//IB_LOG_INFO ("current thread", (uint32_t)current_thread_name);
if (implpriv->u.spin.owner_thread == current_thread_name)
{
/* we are the owners of the lock, update counter */
implpriv->u.spin.spin_count++;
//IB_LOG_INFO ("current thread owns lock", (uint32_t)current_thread_name);
//IB_LOG_INFO ("implpriv->spin_count =", implpriv->u.spin.spin_count);
//IB_LOG_INFO ("handle->status", handle->status);
(void)pthread_mutex_unlock (&implpriv->u.spin.mutex);
IB_EXIT (function, VSTATUS_OK);
return VSTATUS_OK;
}
else
{
/* wait until we are woken, either by vs_lock_delete or vs_spinunlock */
while (handle->status == VLOCK_LOCKED)
{
//IB_LOG_INFO0 ("lock is locked and we are not owner; going to sleep");
wake_me_up = (uint32_t)1U;
(void)pthread_cond_wait (&implpriv->u.spin.cond, &implpriv->u.spin.mutex);
}
}
}
if (wake_me_up == (uint32_t)1U)
{
//IB_LOG_INFO0 ("thread has woken up");
}
if (handle->magic == VLOCK_SPINLOCK_MAGIC)
{
//IB_LOG_INFO ("lock has been freed, locking", handle->status);
handle->status = VLOCK_LOCKED;
implpriv->u.spin.spin_count = 1;
//IB_LOG_INFO ("implpriv->spin_count =", implpriv->u.spin.spin_count);
/* set the thread name */
rc = vs_thread_name (&implpriv->u.spin.owner_thread);
if (rc != VSTATUS_OK)
{
IB_LOG_ERROR0 ("Unable to set owner_thread");
}
else
{
//IB_LOG_INFO ("setting owner_thread", (uint32_t)implpriv->u.spin.owner_thread);
}
}
else
{
(void)pthread_mutex_unlock (&implpriv->u.spin.mutex);
IB_LOG_ERROR0 ("Lock no longer exists");
IB_EXIT (function, VSTATUS_NXIO);
return VSTATUS_NXIO;
}
//IB_LOG_INFO ("handle->status", handle->status);
(void)pthread_mutex_unlock (&implpriv->u.spin.mutex);
IB_EXIT (function, VSTATUS_OK);
return VSTATUS_OK;
}
/**********************************************************************
*
* FUNCTION
* vs_spinunlock
*
* DESCRIPTION
* Release the spin lock associated with the handle.
*
* INPUTS
* handle - A pointer to the spin lock control object filled in
* by vs_lock_init().
*
* OUTPUTS
* Status_t - On success VSTATUS_OK is returned, otherwise
* the cause of the error.
*
*
* HISTORY
*
* NAME DATE REMARKS
* MGR 03/01/02 Initial creation of function.
* MGR 03/13/02 Added recursion support.
* MGR 04/10/02 PR1716. Wake blocking thread after unwinding.
*
**********************************************************************/
Status_t
vs_spinunlock (Lock_t *handle)
{
Status_t rc;
Implpriv_Lock_t *implpriv;
Threadname_t current_thread_name;
static const char function[] = "vs_spinunlock";
IB_ENTER (function,
(unint)handle,
(uint32_t)0U,
(uint32_t)0U,
(uint32_t)0U);
/*
** Validate handle
*/
if (handle == NULL)
{
IB_LOG_ERROR0 ("NULL handle pointer");
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
if (handle->type != VLOCK_SPIN)
{
IB_LOG_ERROR ("Lock type is not spinlock type:", handle->type);
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
if (handle->magic != VLOCK_SPINLOCK_MAGIC)
{
IB_LOG_ERRORX ("Lock does not exist magic:", handle->magic);
IB_EXIT (function, VSTATUS_ILLPARM);
return VSTATUS_ILLPARM;
}
implpriv = (Implpriv_Lock_t *)handle->opaque;
(void)pthread_mutex_lock (&implpriv->u.spin.mutex);
if (implpriv->u.spin.spin_count < 1)
{
/* lock is already free */
(void)pthread_mutex_unlock (&implpriv->u.spin.mutex);
IB_LOG_ERROR0 ("Attempting to unlock already free lock");
IB_EXIT (function, VSTATUS_NXIO);
return VSTATUS_NXIO;
}
/* we can only unlock if we are the owner */
//IB_LOG_INFO0 ("lock is locked");
rc = vs_thread_name (¤t_thread_name);
if (rc != VSTATUS_OK)
{
(void)pthread_mutex_unlock (&implpriv->u.spin.mutex);
IB_LOG_ERRORRC("vs_thread_name error rc:", rc);
IB_EXIT (function, VSTATUS_NXIO);
return VSTATUS_NXIO;
}
//IB_LOG_INFO ("thread owning lock", (uint32_t)implpriv->u.spin.owner_thread);
//IB_LOG_INFO ("current thread", (uint32_t)current_thread_name);
if (implpriv->u.spin.owner_thread != current_thread_name)
{
(void)pthread_mutex_unlock (&implpriv->u.spin.mutex);
IB_LOG_ERRORX ("current thread does not own lock. owner:",
(uint32_t)implpriv->u.spin.owner_thread);
IB_EXIT (function, VSTATUS_NXIO);
return VSTATUS_NXIO;
}
/* decrement counter */
//IB_LOG_INFO ("current thread owns lock", (uint32_t)current_thread_name);
implpriv->u.spin.spin_count--;
//IB_LOG_INFO ("implpriv->spin_count =", implpriv->u.spin.spin_count);
if (!implpriv->u.spin.spin_count)
{
/* lock has completely un-nested */
//IB_LOG_INFO0 ("lock has completed un-nested");
handle->status = VLOCK_FREE;
implpriv->u.spin.owner_thread = (uint64_t)0ULL;
/* awaken a sleeping thread */
(void)pthread_cond_signal (&implpriv->u.spin.cond);
}
//IB_LOG_INFO ("handle->status =", handle->status);
(void)pthread_mutex_unlock (&implpriv->u.spin.mutex);
IB_EXIT (function, VSTATUS_OK);
return VSTATUS_OK;
}