mirror of git://gcc.gnu.org/git/gcc.git
70 lines
1.6 KiB
Go
70 lines
1.6 KiB
Go
// Copyright 2009 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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package runtime
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import (
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"runtime/internal/atomic"
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_ "unsafe" // for go:linkname
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)
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//go:generate go run wincallback.go
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//go:generate go run mkduff.go
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//go:generate go run mkfastlog2table.go
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// For gccgo, while we still have C runtime code, use go:linkname to
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// rename some functions to themselves, so that the compiler will
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// export them.
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//
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//go:linkname tickspersecond runtime.tickspersecond
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var ticks struct {
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lock mutex
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pad uint32 // ensure 8-byte alignment of val on 386
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val uint64
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}
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// Note: Called by runtime/pprof in addition to runtime code.
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func tickspersecond() int64 {
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r := int64(atomic.Load64(&ticks.val))
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if r != 0 {
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return r
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}
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lock(&ticks.lock)
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r = int64(ticks.val)
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if r == 0 {
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t0 := nanotime()
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c0 := cputicks()
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usleep(100 * 1000)
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t1 := nanotime()
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c1 := cputicks()
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if t1 == t0 {
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t1++
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}
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r = (c1 - c0) * 1000 * 1000 * 1000 / (t1 - t0)
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if r == 0 {
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r++
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}
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atomic.Store64(&ticks.val, uint64(r))
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}
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unlock(&ticks.lock)
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return r
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}
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var envs []string
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var argslice []string
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//go:linkname syscall_runtime_envs syscall.runtime_envs
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func syscall_runtime_envs() []string { return append([]string{}, envs...) }
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//go:linkname os_runtime_args os.runtime_args
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func os_runtime_args() []string { return append([]string{}, argslice...) }
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// Temporary, for the gccgo runtime code written in C.
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//go:linkname get_envs runtime_get_envs
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func get_envs() []string { return envs }
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//go:linkname get_args runtime_get_args
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func get_args() []string { return argslice }
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