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This avoids the need to forward exception messages to the debugger, since we can reasonably insist that we're the first handler in the chain for each thread. Copied from Perforce Change: 182925 ServerID: perforce.ravenbrook.com
289 lines
8.2 KiB
C
289 lines
8.2 KiB
C
/* thxc.c: MAC OS X THREADS MANAGER
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*
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* $Id$
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* Copyright (c) 2013 Ravenbrook Limited. See end of file for license.
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*
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* REFERENCES
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* "Abusing Mach on Mac OS X" <http://www.uninformed.org/?v=4&a=3&t=pdf>
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* Mach man pages <http://felinemenace.org/~nemo/mach/manpages/>
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*
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* TODO: Consider making Register a no-op and using task_threads().
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*/
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#include "mpm.h"
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#include <mach/mach_init.h>
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#include <mach/task.h>
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#include <mach/thread_act.h>
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#include <mach/thread_status.h>
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SRCID(thxc, "$Id$");
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typedef struct mps_thr_s { /* OS X / Mach thread structure */
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Sig sig; /* <design/sig/> */
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Serial serial; /* from arena->threadSerial */
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Arena arena; /* owning arena */
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RingStruct arenaRing; /* attaches to arena */
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thread_port_t port; /* thread kernel port */
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} ThreadStruct;
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Bool ThreadCheck(Thread thread)
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{
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CHECKS(Thread, thread);
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CHECKU(Arena, thread->arena);
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CHECKL(thread->serial < thread->arena->threadSerial);
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CHECKL(RingCheck(&thread->arenaRing));
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/* FIXME: How to check thread->port? */
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return TRUE;
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}
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Bool ThreadCheckSimple(Thread thread)
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{
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CHECKS(Thread, thread);
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return TRUE;
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}
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/* FIXME: Too much code in common with than.c, thix.c */
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Res ThreadRegister(Thread *threadReturn, Arena arena)
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{
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Res res;
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Thread thread;
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Ring ring;
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void *p;
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extern void protThreadRegister(Bool setup);
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AVER(threadReturn != NULL);
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res = ControlAlloc(&p, arena, sizeof(ThreadStruct),
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/* withReservoirPermit */ FALSE);
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if(res != ResOK) return res;
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thread = (Thread)p;
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thread->arena = arena;
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RingInit(&thread->arenaRing);
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thread->sig = ThreadSig;
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thread->serial = arena->threadSerial;
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++arena->threadSerial;
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thread->port = mach_thread_self();
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/* FIXME: Set up thread specific exception ports?
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(Boehm just does it for the whole task.) */
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protThreadRegister(FALSE);
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AVERT(Thread, thread);
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ring = ArenaThreadRing(arena);
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RingAppend(ring, &thread->arenaRing);
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*threadReturn = thread;
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return ResOK;
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}
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void ThreadDeregister(Thread thread, Arena arena)
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{
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AVERT(Thread, thread);
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AVERT(Arena, arena);
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RingRemove(&thread->arenaRing);
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thread->sig = SigInvalid;
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RingFinish(&thread->arenaRing);
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ControlFree(arena, thread, sizeof(ThreadStruct));
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}
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/* mapThreadRing -- map over threads on ring calling a function on each one
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* except the current thread
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*/
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static void mapThreadRing(Ring threadRing, void (*func)(Thread))
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{
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Ring node, next;
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mach_port_t self;
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AVERT(Ring, threadRing);
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self = mach_thread_self();
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RING_FOR(node, threadRing, next) {
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Thread thread = RING_ELT(Thread, arenaRing, node);
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AVERT(Thread, thread);
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if(thread->port != self)
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(*func)(thread);
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}
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}
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static void threadSuspend(Thread thread)
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{
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/* FIXME: Think about error cases */
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/* FIXME: Do threads take any time to suspend? Need to rendezvous? */
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(void)thread_suspend(thread->port);
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}
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static void threadResume(Thread thread)
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{
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/* FIXME: Think about error cases */
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/* FIXME: Does client code have to watch for EAGAIN? */
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(void)thread_resume(thread->port);
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}
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/* ThreadRingSuspend -- suspend all threads on a ring, expect the current one */
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void ThreadRingSuspend(Ring threadRing)
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{
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AVERT(Ring, threadRing);
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mapThreadRing(threadRing, threadSuspend);
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}
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/* ThreadRingResume -- resume all threads on a ring, expect the current one */
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void ThreadRingResume(Ring threadRing)
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{
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AVERT(Ring, threadRing);
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mapThreadRing(threadRing, threadResume);
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}
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Thread ThreadRingThread(Ring threadRing)
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{
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Thread thread;
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AVERT(Ring, threadRing);
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thread = RING_ELT(Thread, arenaRing, threadRing);
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AVERT(Thread, thread);
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return thread;
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}
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/* Must be thread-safe. See <design/interface-c/#thread-safety>. */
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Arena ThreadArena(Thread thread)
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{
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/* Can't AVER thread as that would not be thread-safe */
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/* AVERT(Thread, thread); */
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return thread->arena;
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}
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/* ThreadScan -- scan the state of a thread (stack and regs) */
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#include "prmcxc.h"
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Res ThreadScan(ScanState ss, Thread thread, void *stackBot)
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{
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mach_port_t self;
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Res res;
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AVERT(Thread, thread);
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self = mach_thread_self();
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if (thread->port == self) {
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/* scan this thread's stack */
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res = StackScan(ss, stackBot);
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if(res != ResOK)
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return res;
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} else {
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MutatorFaultContextStruct mfcStruct;
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Addr *stackBase, *stackLimit, stackPtr;
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mach_msg_type_number_t count;
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kern_return_t kern_return;
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/* FIXME: Assert that threads have been suspended? */
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count = THREAD_STATE_COUNT;
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AVER(sizeof(mfcStruct.thread_state) == count * sizeof(natural_t));
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kern_return = thread_get_state(thread->port,
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THREAD_STATE_FLAVOR,
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(thread_state_t)&mfcStruct.thread_state,
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&count);
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/* FIXME: error checking */
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AVER(kern_return == KERN_SUCCESS);
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AVER(count == THREAD_STATE_COUNT);
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stackPtr = MutatorFaultContextSP(&mfcStruct);
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/* .stack.align */
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stackBase = (Addr *)AddrAlignUp(stackPtr, sizeof(Addr));
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stackLimit = (Addr *)stackBot;
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if (stackBase >= stackLimit)
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return ResOK; /* .stack.below-bottom */
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/* scan stack inclusive of current sp and exclusive of
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* stackBot (.stack.full-descend)
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*/
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res = TraceScanAreaTagged(ss, stackBase, stackLimit);
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if(res != ResOK)
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return res;
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/* scan the registers in the mutator fault context */
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res = MutatorFaultContextScan(ss, &mfcStruct);
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if(res != ResOK)
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return res;
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}
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return ResOK;
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}
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Res ThreadDescribe(Thread thread, mps_lib_FILE *stream)
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{
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Res res;
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res = WriteF(stream,
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"Thread $P ($U) {\n", (WriteFP)thread, (WriteFU)thread->serial,
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" arena $P ($U)\n",
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(WriteFP)thread->arena, (WriteFU)thread->arena->serial,
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" port $U\n", (WriteFU)thread->port,
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"} Thread $P ($U)\n", (WriteFP)thread, (WriteFU)thread->serial,
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NULL);
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if(res != ResOK) return res;
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return ResOK;
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}
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/* C. COPYRIGHT AND LICENSE
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*
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* Copyright (C) 2001-2002 Ravenbrook Limited <http://www.ravenbrook.com/>.
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* All rights reserved. This is an open source license. Contact
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* Ravenbrook for commercial licensing options.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Redistributions in any form must be accompanied by information on how
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* to obtain complete source code for this software and any accompanying
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* software that uses this software. The source code must either be
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* included in the distribution or be available for no more than the cost
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* of distribution plus a nominal fee, and must be freely redistributable
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* under reasonable conditions. For an executable file, complete source
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* code means the source code for all modules it contains. It does not
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* include source code for modules or files that typically accompany the
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* major components of the operating system on which the executable file
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* runs.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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* PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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