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Add pthread_testcancel(), pthread_testcancel(), and definitiions for cancellation types.

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This commit is contained in:
Gregory Nutt 2016-12-09 07:23:00 -06:00
parent 6224e47533
commit acaae12e8b
10 changed files with 274 additions and 14 deletions
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12
include/nuttx/sched.h
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@ -141,16 +141,18 @@
# define TCB_FLAG_TTYPE_PTHREAD (1 << TCB_FLAG_TTYPE_SHIFT) /* User pthread */
# define TCB_FLAG_TTYPE_KERNEL (2 << TCB_FLAG_TTYPE_SHIFT) /* Kernel thread */
#define TCB_FLAG_NONCANCELABLE (1 << 2) /* Bit 2: Pthread is non-cancelable */
#define TCB_FLAG_CANCEL_PENDING (1 << 3) /* Bit 3: Pthread cancel is pending */
#define TCB_FLAG_POLICY_SHIFT (4) /* Bit 4-5: Scheduling policy */
#define TCB_FLAG_CANCEL_DEFERRED (1 << 3) /* Bit 3: Deferred (vs asynch) cancellation type */
#define TCB_FLAG_CANCEL_POINT (1 << 4) /* Bit 4: At a cancellation point */
#define TCB_FLAG_CANCEL_PENDING (1 << 5) /* Bit 5: Pthread cancel is pending */
#define TCB_FLAG_POLICY_SHIFT (6) /* Bit 6-7: Scheduling policy */
#define TCB_FLAG_POLICY_MASK (3 << TCB_FLAG_POLICY_SHIFT)
# define TCB_FLAG_SCHED_FIFO (0 << TCB_FLAG_POLICY_SHIFT) /* FIFO scheding policy */
# define TCB_FLAG_SCHED_RR (1 << TCB_FLAG_POLICY_SHIFT) /* Round robin scheding policy */
# define TCB_FLAG_SCHED_SPORADIC (2 << TCB_FLAG_POLICY_SHIFT) /* Sporadic scheding policy */
# define TCB_FLAG_SCHED_OTHER (3 << TCB_FLAG_POLICY_SHIFT) /* Other scheding policy */
#define TCB_FLAG_CPU_LOCKED (1 << 6) /* Bit 6: Locked to this CPU */
#define TCB_FLAG_EXIT_PROCESSING (1 << 7) /* Bit 7: Exitting */
/* Bits 8-15: Available */
#define TCB_FLAG_CPU_LOCKED (1 << 8) /* Bit 8: Locked to this CPU */
#define TCB_FLAG_EXIT_PROCESSING (1 << 9) /* Bit 9: Exitting */
/* Bits 10-15: Available */
/* Values for struct task_group tg_flags */

8
include/pthread.h
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@ -115,11 +115,16 @@
#define PTHREAD_DEFAULT_PRIORITY 100
/* Cancellation states returned by pthread_cancelstate() */
/* Cancellation states used by pthread_setcancelstate() */
#define PTHREAD_CANCEL_ENABLE (0)
#define PTHREAD_CANCEL_DISABLE (1)
/* Cancellation types used by pthread_setcanceltype() */
#define PTHREAD_CANCEL_DEFERRED (0)
#define PTHREAD_CANCEL_ASYNCHRONOUS (1)
/* Thread return value when a pthread is canceled */
#define PTHREAD_CANCELED ((FAR void*)ERROR)
@ -340,6 +345,7 @@ int pthread_detach(pthread_t thread);
void pthread_exit(pthread_addr_t value) noreturn_function;
int pthread_cancel(pthread_t thread);
int pthread_setcancelstate(int state, FAR int *oldstate);
int pthread_setcanceltype(int type, FAR int *oldtype);
void pthread_testcancel(void);
/* A thread may set up cleanup functions to execut when the thread exits or

9
sched/Kconfig
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@ -560,6 +560,15 @@ config PTHREAD_CLEANUP_STACKSIZE
endmenu # Pthread Options
config CANCELLATION_POINTS
bool "Cancellation points"
default n
depends on EXPERIMENTAL
---help---
Enable POSIX cancellation points for pthread_cancel(). If selected,
cancellation points will also used with the () task_delete() API even if
pthreads are not enabled.
menu "Performance Monitoring"
config SCHED_CPULOAD

3
sched/pthread/Make.defs
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@ -42,7 +42,8 @@ CSRCS += pthread_mutexlock.c pthread_mutextrylock.c pthread_mutexunlock.c
CSRCS += pthread_condinit.c pthread_conddestroy.c
CSRCS += pthread_condwait.c pthread_condsignal.c pthread_condbroadcast.c
CSRCS += pthread_barrierinit.c pthread_barrierdestroy.c pthread_barrierwait.c
CSRCS += pthread_cancel.c pthread_setcancelstate.c
CSRCS += pthread_cancel.c pthread_setcancelstate.c pthread_setcanceltype.c
CSRCS += pthread_testcancel.c
CSRCS += pthread_keycreate.c pthread_setspecific.c pthread_getspecific.c pthread_keydelete.c
CSRCS += pthread_initialize.c pthread_completejoin.c pthread_findjoininfo.c
CSRCS += pthread_once.c pthread_release.c pthread_setschedprio.c

3
sched/pthread/pthread_cleanup.c
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@ -67,6 +67,9 @@
* Return Value:
* None
*
* Assumptions:
* The scheduler is locked.
*
****************************************************************************/
static void pthread_cleanup_pop_tcb(FAR struct pthread_tcb_s *tcb, int execute)

6
sched/pthread/pthread_create.c
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@ -483,6 +483,12 @@ int pthread_create(FAR pthread_t *thread, FAR const pthread_attr_t *attr,
#endif
}
#ifdef CONFIG_CANCELLATION_POINTS
/* Set the deferred cancellation type */
ptcb->cmn.flags |= TCB_FLAG_CANCEL_DEFERRED;
#endif
/* Get the assigned pid before we start the task (who knows what
* could happen to ptcb after this!). Copy this ID into the join structure
* as well.

47
sched/pthread/pthread_setcancelstate.c
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@ -47,6 +47,18 @@
/****************************************************************************
* Name: pthread_setcancelstate
*
* Description:
* The pthread_setcancelstate() function atomically both sets the calling
* thread's cancelability state to the indicated state and returns the
* previous cancelability state at the location referenced by oldstate.
* Legal values for state are PTHREAD_CANCEL_ENABLE and
* PTHREAD_CANCEL_DISABLE.
*
* The cancelability state and type of any newly created threads,
* including the thread in which main() was first invoked, are
* PTHREAD_CANCEL_ENABLE and PTHREAD_CANCEL_DEFERRED respectively.
*
****************************************************************************/
int pthread_setcancelstate(int state, FAR int *oldstate)
@ -78,17 +90,38 @@ int pthread_setcancelstate(int state, FAR int *oldstate)
if (state == PTHREAD_CANCEL_ENABLE)
{
unsigned flags = tcb->flags;
/* Clear the non-cancelable flag */
/* Clear the non-cancelable and cancel pending flags */
tcb->flags &= ~TCB_FLAG_NONCANCELABLE;
tcb->flags &= ~(TCB_FLAG_NONCANCELABLE | TCB_FLAG_CANCEL_PENDING);
/* Check if a cancellation was pending */
/* If the cancel was pending, then just exit as requested */
if (flags & TCB_FLAG_CANCEL_PENDING)
if ((tcb->flags & TCB_FLAG_CANCEL_PENDING) != 0)
{
pthread_exit(PTHREAD_CANCELED);
#ifdef CONFIG_CANCELLATION_POINTS
/* If we are using deferred cancellation? */
if ((tcb->flags & TCB_FLAG_CANCEL_DEFERRED) != 0)
{
/* Yes.. If we are within a cancellation point, then
* notify of the cancellation.
*/
if (tcb->flags & TCB_FLAG_CANCEL_POINT) != 0)
{
# warning Missing logic
}
}
else
#endif
{
/* No.. We are using asynchronous cancellation. If the
* cancellation was pending in this case, then just exit.
*/
tcb->flags &= ~TCB_FLAG_CANCEL_PENDING;
pthread_exit(PTHREAD_CANCELED);
}
}
}
else if (state == PTHREAD_CANCEL_DISABLE)

128
sched/pthread/pthread_setcanceltype.c Normal file
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@ -0,0 +1,128 @@
/****************************************************************************
* sched/pthread/pthread_setcanceltype.c
*
* Copyright (C) 2016 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <pthread.h>
#include <errno.h>
#include "sched/sched.h"
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: pthread_setcancelstate
*
* Description:
* The pthread_setcanceltype() function atomically both sets the calling
* thread's cancelability type to the indicated type and returns the
* previous cancelability type at the location referenced by oldtype
* Legal values for type are PTHREAD_CANCEL_DEFERRED and
* PTHREAD_CANCEL_ASYNCHRONOUS.
*
* The cancelability state and type of any newly created threads,
* including the thread in which main() was first invoked, are
* PTHREAD_CANCEL_ASYNCHRONOUS and PTHREAD_CANCEL_DEFERRED respectively.
*
****************************************************************************/
int pthread_setcanceltype(int type, FAR int *oldtype)
{
FAR struct tcb_s *tcb = this_task();
int ret = OK;
/* Suppress context changes for a bit so that the flags are stable. (the
* flags should not change in interrupt handling).
*/
sched_lock();
/* Return the current type if so requrested */
if (oldtype)
{
if ((tcb->flags & TCB_FLAG_CANCEL_DEFERRED) != 0)
{
*oldtype = PTHREAD_CANCEL_DEFERRED;
}
else
{
*oldtype = PTHREAD_CANCEL_ASYNCHRONOUS;
}
}
/* Set the new cancellation type */
if (type == PTHREAD_CANCEL_ASYNCHRONOUS)
{
/* Clear the deferred cancellation bit */
tcb->flags &= ~TCB_FLAG_CANCEL_DEFERRED;
#ifdef CONFIG_CANCELLATION_POINTS
/* If we just switched from deferred to asynchronous type and if a
* cancellation is pending, then exit now.
*/
if ((tcb->flags & TCB_FLAG_CANCEL_PENDING) != 0 &&
(tcb->flags & TCB_FLAG_NONCANCELABLE) == 0)
{
tcb->flags &= ~TCB_FLAG_CANCEL_PENDING;
pthread_exit(PTHREAD_CANCELED);
}
#endif
}
#ifdef CONFIG_CANCELLATION_POINTS
else if (type == PTHREAD_CANCEL_DEFERRED)
{
/* Set the deferred cancellation type */
tcb->flags |= TCB_FLAG_CANCEL_DEFERRED;
}
#endif
else
{
ret = EINVAL;
}
sched_unlock();
return ret;
}

66
sched/pthread/pthread_testcancel.c Normal file
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@ -0,0 +1,66 @@
/****************************************************************************
* sched/pthread/pthread_testcancel.c
*
* Copyright (C) 2016 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <pthread.h>
#include <errno.h>
#include "sched/sched.h"
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: pthread_testcancel
*
* Description:
* The pthread_testcancel() function creates a cancellation point in the
* calling thread. The pthread_testcancel() function has no effect if
* cancelability is disabled
*
****************************************************************************/
void pthread_testcancel(void)
{
#ifdef CONFIG_CANCELLATION_POINTS
# warning Missing Logic
#endif
}

6
sched/task/task_setup.c
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@ -378,6 +378,12 @@ static int thread_schedsetup(FAR struct tcb_s *tcb, int priority,
tcb->flags &= ~TCB_FLAG_TTYPE_MASK;
tcb->flags |= ttype;
#ifdef CONFIG_CANCELLATION_POINTS
/* Set the deferred cancellation type */
tcb->flags |= TCB_FLAG_CANCEL_DEFERRED;
#endif
/* Save the task ID of the parent task in the TCB and allocate
* a child status structure.
*/