193 lines
6.9 KiB
Go
193 lines
6.9 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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/*
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The runtime package contains operations that interact with Go's runtime system,
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such as functions to control goroutines. It also includes the low-level type information
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used by the reflect package; see reflect's documentation for the programmable
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interface to the run-time type system.
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*/
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package runtime
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// Gosched yields the processor, allowing other goroutines to run. It does not
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// suspend the current goroutine, so execution resumes automatically.
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func Gosched()
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// Goexit terminates the goroutine that calls it. No other goroutine is affected.
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// Goexit runs all deferred calls before terminating the goroutine.
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func Goexit()
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// Caller reports file and line number information about function invocations on
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// the calling goroutine's stack. The argument skip is the number of stack frames to
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// ascend, with 0 identifying the the caller of Caller. The return values report the
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// program counter, file name, and line number within the file of the corresponding
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// call. The boolean ok is false if it was not possible to recover the information.
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func Caller(skip int) (pc uintptr, file string, line int, ok bool)
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// Callers fills the slice pc with the program counters of function invocations
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// on the calling goroutine's stack. The argument skip is the number of stack frames
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// to skip before recording in pc, with 0 starting at the caller of Caller.
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// It returns the number of entries written to pc.
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func Callers(skip int, pc []uintptr) int
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type Func struct { // Keep in sync with runtime.h:struct Func
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name string
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typ string // go type string
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src string // src file name
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pcln []byte // pc/ln tab for this func
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entry uintptr // entry pc
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pc0 uintptr // starting pc, ln for table
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ln0 int32
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frame int32 // stack frame size
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args int32 // number of 32-bit in/out args
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locals int32 // number of 32-bit locals
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}
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// FuncForPC returns a *Func describing the function that contains the
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// given program counter address, or else nil.
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func FuncForPC(pc uintptr) *Func
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// Name returns the name of the function.
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func (f *Func) Name() string { return f.name }
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// Entry returns the entry address of the function.
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func (f *Func) Entry() uintptr { return f.entry }
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// FileLine returns the file name and line number of the
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// source code corresponding to the program counter pc.
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// The result will not be accurate if pc is not a program
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// counter within f.
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func (f *Func) FileLine(pc uintptr) (file string, line int) {
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// NOTE(rsc): If you edit this function, also edit
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// symtab.c:/^funcline. That function also has the
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// comments explaining the logic.
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targetpc := pc
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var pcQuant uintptr = 1
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if GOARCH == "arm" {
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pcQuant = 4
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}
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p := f.pcln
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pc = f.pc0
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line = int(f.ln0)
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i := 0
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//print("FileLine start pc=", pc, " targetpc=", targetpc, " line=", line,
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// " tab=", p, " ", p[0], " quant=", pcQuant, " GOARCH=", GOARCH, "\n")
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for {
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for i < len(p) && p[i] > 128 {
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pc += pcQuant * uintptr(p[i]-128)
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i++
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}
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//print("pc<", pc, " targetpc=", targetpc, " line=", line, "\n")
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if pc > targetpc || i >= len(p) {
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break
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}
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if p[i] == 0 {
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if i+5 > len(p) {
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break
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}
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line += int(p[i+1]<<24) | int(p[i+2]<<16) | int(p[i+3]<<8) | int(p[i+4])
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i += 5
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} else if p[i] <= 64 {
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line += int(p[i])
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i++
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} else {
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line -= int(p[i] - 64)
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i++
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}
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//print("pc=", pc, " targetpc=", targetpc, " line=", line, "\n")
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pc += pcQuant
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}
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file = f.src
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return
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}
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// mid returns the current os thread (m) id.
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func mid() uint32
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// Semacquire waits until *s > 0 and then atomically decrements it.
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// It is intended as a simple sleep primitive for use by the synchronization
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// library and should not be used directly.
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func Semacquire(s *uint32)
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// Semrelease atomically increments *s and notifies a waiting goroutine
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// if one is blocked in Semacquire.
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// It is intended as a simple wakeup primitive for use by the synchronization
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// library and should not be used directly.
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func Semrelease(s *uint32)
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// SetFinalizer sets the finalizer associated with x to f.
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// When the garbage collector finds an unreachable block
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// with an associated finalizer, it clears the association and runs
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// f(x) in a separate goroutine. This makes x reachable again, but
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// now without an associated finalizer. Assuming that SetFinalizer
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// is not called again, the next time the garbage collector sees
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// that x is unreachable, it will free x.
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//
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// SetFinalizer(x, nil) clears any finalizer associated with x.
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//
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// The argument x must be a pointer to an object allocated by
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// calling new or by taking the address of a composite literal.
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// The argument f must be a function that takes a single argument
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// of x's type and returns no arguments. If either of these is not
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// true, SetFinalizer aborts the program.
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//
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// Finalizers are run in dependency order: if A points at B, both have
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// finalizers, and they are otherwise unreachable, only the finalizer
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// for A runs; once A is freed, the finalizer for B can run.
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// If a cyclic structure includes a block with a finalizer, that
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// cycle is not guaranteed to be garbage collected and the finalizer
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// is not guaranteed to run, because there is no ordering that
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// respects the dependencies.
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//
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// The finalizer for x is scheduled to run at some arbitrary time after
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// x becomes unreachable.
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// There is no guarantee that finalizers will run before a program exits,
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// so typically they are useful only for releasing non-memory resources
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// associated with an object during a long-running program.
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// For example, an os.File object could use a finalizer to close the
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// associated operating system file descriptor when a program discards
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// an os.File without calling Close, but it would be a mistake
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// to depend on a finalizer to flush an in-memory I/O buffer such as a
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// bufio.Writer, because the buffer would not be flushed at program exit.
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//
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// A single goroutine runs all finalizers for a program, sequentially.
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// If a finalizer must run for a long time, it should do so by starting
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// a new goroutine.
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//
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// TODO(rsc): allow f to have (ignored) return values
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//
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func SetFinalizer(x, f interface{})
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func getgoroot() string
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// GOROOT returns the root of the Go tree.
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// It uses the GOROOT environment variable, if set,
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// or else the root used during the Go build.
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func GOROOT() string {
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s := getgoroot()
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if s != "" {
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return s
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}
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return defaultGoroot
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}
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// Version returns the Go tree's version string.
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// It is either a sequence number or, when possible,
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// a release tag like "release.2010-03-04".
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// A trailing + indicates that the tree had local modifications
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// at the time of the build.
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func Version() string {
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return theVersion
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}
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// GOOS is the Go tree's operating system target:
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// one of darwin, freebsd, linux, and so on.
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const GOOS string = theGoos
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// GOARCH is the Go tree's architecture target:
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// 386, amd64, or arm.
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const GOARCH string = theGoarch
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