mirror of https://go.googlesource.com/go
159 lines
4.2 KiB
C
159 lines
4.2 KiB
C
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include <process.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "libcgo.h"
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#include "libcgo_windows.h"
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// Ensure there's one symbol marked __declspec(dllexport).
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// If there are no exported symbols, the unfortunate behavior of
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// the binutils linker is to also strip the relocations table,
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// resulting in non-PIE binary. The other option is the
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// --export-all-symbols flag, but we don't need to export all symbols
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// and this may overflow the export table (#40795).
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// See https://sourceware.org/bugzilla/show_bug.cgi?id=19011
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__declspec(dllexport) int _cgo_dummy_export;
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static volatile LONG runtime_init_once_gate = 0;
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static volatile LONG runtime_init_once_done = 0;
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static CRITICAL_SECTION runtime_init_cs;
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static HANDLE runtime_init_wait;
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static int runtime_init_done;
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uintptr_t x_cgo_pthread_key_created;
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void (*x_crosscall2_ptr)(void (*fn)(void *), void *, int, size_t);
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// Pre-initialize the runtime synchronization objects
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void
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_cgo_preinit_init() {
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runtime_init_wait = CreateEvent(NULL, TRUE, FALSE, NULL);
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if (runtime_init_wait == NULL) {
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fprintf(stderr, "runtime: failed to create runtime initialization wait event.\n");
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abort();
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}
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InitializeCriticalSection(&runtime_init_cs);
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}
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// Make sure that the preinit sequence has run.
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void
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_cgo_maybe_run_preinit() {
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if (!InterlockedExchangeAdd(&runtime_init_once_done, 0)) {
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if (InterlockedIncrement(&runtime_init_once_gate) == 1) {
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_cgo_preinit_init();
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InterlockedIncrement(&runtime_init_once_done);
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} else {
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// Decrement to avoid overflow.
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InterlockedDecrement(&runtime_init_once_gate);
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while(!InterlockedExchangeAdd(&runtime_init_once_done, 0)) {
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Sleep(0);
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}
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}
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}
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}
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void
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x_cgo_sys_thread_create(void (*func)(void*), void* arg) {
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_cgo_beginthread(func, arg);
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}
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int
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_cgo_is_runtime_initialized() {
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EnterCriticalSection(&runtime_init_cs);
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int status = runtime_init_done;
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LeaveCriticalSection(&runtime_init_cs);
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return status;
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}
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uintptr_t
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_cgo_wait_runtime_init_done(void) {
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void (*pfn)(struct context_arg*);
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_cgo_maybe_run_preinit();
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while (!_cgo_is_runtime_initialized()) {
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WaitForSingleObject(runtime_init_wait, INFINITE);
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}
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pfn = _cgo_get_context_function();
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if (pfn != nil) {
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struct context_arg arg;
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arg.Context = 0;
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(*pfn)(&arg);
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return arg.Context;
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}
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return 0;
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}
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// Should not be used since x_cgo_pthread_key_created will always be zero.
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void x_cgo_bindm(void* dummy) {
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fprintf(stderr, "unexpected cgo_bindm on Windows\n");
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abort();
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}
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void
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x_cgo_notify_runtime_init_done(void* dummy) {
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_cgo_maybe_run_preinit();
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EnterCriticalSection(&runtime_init_cs);
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runtime_init_done = 1;
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LeaveCriticalSection(&runtime_init_cs);
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if (!SetEvent(runtime_init_wait)) {
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fprintf(stderr, "runtime: failed to signal runtime initialization complete.\n");
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abort();
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}
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}
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// The context function, used when tracing back C calls into Go.
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static void (*cgo_context_function)(struct context_arg*);
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// Sets the context function to call to record the traceback context
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// when calling a Go function from C code. Called from runtime.SetCgoTraceback.
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void x_cgo_set_context_function(void (*context)(struct context_arg*)) {
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EnterCriticalSection(&runtime_init_cs);
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cgo_context_function = context;
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LeaveCriticalSection(&runtime_init_cs);
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}
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// Gets the context function.
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void (*(_cgo_get_context_function(void)))(struct context_arg*) {
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void (*ret)(struct context_arg*);
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EnterCriticalSection(&runtime_init_cs);
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ret = cgo_context_function;
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LeaveCriticalSection(&runtime_init_cs);
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return ret;
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}
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void _cgo_beginthread(void (*func)(void*), void* arg) {
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int tries;
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uintptr_t thandle;
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for (tries = 0; tries < 20; tries++) {
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thandle = _beginthread(func, 0, arg);
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if (thandle == -1 && errno == EACCES) {
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// "Insufficient resources", try again in a bit.
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//
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// Note that the first Sleep(0) is a yield.
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Sleep(tries); // milliseconds
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continue;
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} else if (thandle == -1) {
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break;
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}
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return; // Success!
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}
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fprintf(stderr, "runtime: failed to create new OS thread (%d)\n", errno);
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abort();
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}
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