mirror of
https://github.com/golang/go
synced 2024-11-20 01:04:40 -07:00
ee24bfc058
The change introduces 2 generic mutex implementations (futex- and semaphore-based). Each OS chooses a suitable mutex implementation and implements few callbacks (e.g. futex wait/wake). The CL reduces code duplication, extends some optimizations available only on Linux/Windows to other OSes and provides ground for futher optimizations. Chan finalizers are finally eliminated. (Linux/amd64, 8 HT cores) benchmark old new BenchmarkChanContended 83.6 77.8 ns/op BenchmarkChanContended-2 341 328 ns/op BenchmarkChanContended-4 382 383 ns/op BenchmarkChanContended-8 390 374 ns/op BenchmarkChanContended-16 313 291 ns/op (Darwin/amd64, 2 cores) benchmark old new BenchmarkChanContended 159 172 ns/op BenchmarkChanContended-2 6735 263 ns/op BenchmarkChanContended-4 10384 255 ns/op BenchmarkChanCreation 1174 407 ns/op BenchmarkChanCreation-2 4007 254 ns/op BenchmarkChanCreation-4 4029 246 ns/op R=rsc, jsing, hectorchu CC=golang-dev https://golang.org/cl/5140043
123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
// Use of this source file is governed by a BSD-style
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// license that can be found in the LICENSE file.`
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#include "runtime.h"
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#include "defs.h"
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#include "os.h"
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#include "stack.h"
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extern SigTab runtime·sigtab[];
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extern int32 runtime·sys_umtx_op(uint32*, int32, uint32, void*, void*);
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// FreeBSD's umtx_op syscall is effectively the same as Linux's futex, and
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// thus the code is largely similar. See linux/thread.c for comments.
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void
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runtime·futexsleep(uint32 *addr, uint32 val)
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{
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int32 ret;
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ret = runtime·sys_umtx_op(addr, UMTX_OP_WAIT, val, nil, nil);
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if(ret >= 0 || ret == -EINTR)
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return;
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runtime·printf("umtx_wait addr=%p val=%d ret=%d\n", addr, val, ret);
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*(int32*)0x1005 = 0x1005;
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}
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void
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runtime·futexwakeup(uint32 *addr, uint32 cnt)
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{
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int32 ret;
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ret = runtime·sys_umtx_op(addr, UMTX_OP_WAKE, cnt, nil, nil);
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if(ret >= 0)
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return;
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runtime·printf("umtx_wake addr=%p ret=%d\n", addr, ret);
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*(int32*)0x1006 = 0x1006;
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}
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void runtime·thr_start(void*);
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void
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runtime·newosproc(M *m, G *g, void *stk, void (*fn)(void))
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{
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ThrParam param;
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USED(fn); // thr_start assumes fn == mstart
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USED(g); // thr_start assumes g == m->g0
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if(0){
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runtime·printf("newosproc stk=%p m=%p g=%p fn=%p id=%d/%d ostk=%p\n",
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stk, m, g, fn, m->id, m->tls[0], &m);
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}
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runtime·memclr((byte*)¶m, sizeof param);
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param.start_func = runtime·thr_start;
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param.arg = m;
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param.stack_base = (int8*)g->stackbase;
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param.stack_size = (byte*)stk - (byte*)g->stackbase;
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param.child_tid = (intptr*)&m->procid;
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param.parent_tid = nil;
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param.tls_base = (int8*)&m->tls[0];
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param.tls_size = sizeof m->tls;
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m->tls[0] = m->id; // so 386 asm can find it
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runtime·thr_new(¶m, sizeof param);
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}
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void
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runtime·osinit(void)
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{
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}
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void
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runtime·goenvs(void)
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{
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runtime·goenvs_unix();
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}
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// Called to initialize a new m (including the bootstrap m).
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void
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runtime·minit(void)
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{
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// Initialize signal handling
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m->gsignal = runtime·malg(32*1024);
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runtime·signalstack(m->gsignal->stackguard - StackGuard, 32*1024);
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}
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void
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runtime·sigpanic(void)
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{
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switch(g->sig) {
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case SIGBUS:
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if(g->sigcode0 == BUS_ADRERR && g->sigcode1 < 0x1000)
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runtime·panicstring("invalid memory address or nil pointer dereference");
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runtime·printf("unexpected fault address %p\n", g->sigcode1);
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runtime·throw("fault");
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case SIGSEGV:
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if((g->sigcode0 == 0 || g->sigcode0 == SEGV_MAPERR || g->sigcode0 == SEGV_ACCERR) && g->sigcode1 < 0x1000)
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runtime·panicstring("invalid memory address or nil pointer dereference");
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runtime·printf("unexpected fault address %p\n", g->sigcode1);
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runtime·throw("fault");
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case SIGFPE:
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switch(g->sigcode0) {
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case FPE_INTDIV:
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runtime·panicstring("integer divide by zero");
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case FPE_INTOVF:
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runtime·panicstring("integer overflow");
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}
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runtime·panicstring("floating point error");
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}
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runtime·panicstring(runtime·sigtab[g->sig].name);
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}
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// TODO: fill this in properly.
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void
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runtime·osyield(void)
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{
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}
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