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/* than.c: ANSI THREADS MANAGER
*
* $Id$
* Copyright (c) 2001-2020 Ravenbrook Limited. See end of file for license.
*
* This is a single-threaded implementation of the threads manager.
* Has stubs for thread suspension.
* <design/thread-manager#.impl.an>.
*/
#include "mpm.h"
SRCID(than, "$Id$");
typedef struct mps_thr_s { /* ANSI fake thread structure */
Sig sig; /* design.mps.sig.field */
Serial serial; /* from arena->threadSerial */
Arena arena; /* owning arena */
RingStruct arenaRing; /* attaches to arena */
} ThreadStruct;
Bool ThreadCheck(Thread thread)
{
CHECKS(Thread, thread);
CHECKU(Arena, thread->arena);
CHECKL(thread->serial < thread->arena->threadSerial);
CHECKD_NOSIG(Ring, &thread->arenaRing);
return TRUE;
}
Bool ThreadCheckSimple(Thread thread)
{
CHECKS(Thread, thread);
return TRUE;
}
Res ThreadRegister(Thread *threadReturn, Arena arena)
{
Res res;
Thread thread;
Ring ring;
void *p;
AVER(threadReturn != NULL);
res = ControlAlloc(&p, arena, sizeof(ThreadStruct));
if (res != ResOK)
return res;
thread = (Thread)p;
thread->arena = arena;
RingInit(&thread->arenaRing);
thread->sig = ThreadSig;
thread->serial = arena->threadSerial;
++arena->threadSerial;
AVERT(Thread, thread);
ring = ArenaThreadRing(arena);
RingAppend(ring, &thread->arenaRing);
*threadReturn = thread;
return ResOK;
}
void ThreadDeregister(Thread thread, Arena arena)
{
AVERT(Thread, thread);
AVERT(Arena, arena);
RingRemove(&thread->arenaRing);
thread->sig = SigInvalid;
RingFinish(&thread->arenaRing);
ControlFree(arena, thread, sizeof(ThreadStruct));
}
void ThreadRingSuspend(Ring threadRing, Ring deadRing)
{
AVERT(Ring, threadRing);
AVERT(Ring, deadRing);
}
void ThreadRingResume(Ring threadRing, Ring deadRing)
{
AVERT(Ring, threadRing);
AVERT(Ring, deadRing);
}
Thread ThreadRingThread(Ring threadRing)
{
Thread thread;
AVERT(Ring, threadRing);
thread = RING_ELT(Thread, arenaRing, threadRing);
AVERT(Thread, thread);
return thread;
}
/* Must be thread-safe. <design/interface-c#.check.testt>. */
Arena ThreadArena(Thread thread)
{
AVER(TESTT(Thread, thread));
return thread->arena;
}
Res ThreadScan(ScanState ss, Thread thread, void *stackCold,
mps_area_scan_t scan_area,
void *closure)
{
UNUSED(thread);
return StackScan(ss, stackCold, scan_area, closure);
}
Res ThreadDescribe(Thread thread, mps_lib_FILE *stream, Count depth)
{
Res res;
res = WriteF(stream, depth,
"Thread $P ($U) {\n", (WriteFP)thread, (WriteFU)thread->serial,
" arena $P ($U)\n",
(WriteFP)thread->arena, (WriteFU)thread->arena->serial,
"} Thread $P ($U)\n", (WriteFP)thread, (WriteFU)thread->serial,
NULL);
if (res != ResOK)
return res;
return ResOK;
}
void ThreadSetup(void)
{
/* Nothing to do as ANSI platform does not have fork(). */
}
/* C. COPYRIGHT AND LICENSE
*
* Copyright (C) 2001-2020 Ravenbrook Limited <https://www.ravenbrook.com/>.
*
* 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.
*
* 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
* HOLDER 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.
*/
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