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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

/*
        Package runtime contains operations that interact with Go's runtime system,
        such as functions to control goroutines. It also includes the low-level type information
        used by the reflect package; see reflect's documentation for the programmable
        interface to the run-time type system.
*/
package runtime

// Gosched yields the processor, allowing other goroutines to run.  It does not
// suspend the current goroutine, so execution resumes automatically.
func Gosched()

// Goexit terminates the goroutine that calls it.  No other goroutine is affected.
// Goexit runs all deferred calls before terminating the goroutine.
func Goexit()

// Caller reports file and line number information about function invocations on
// the calling goroutine's stack.  The argument skip is the number of stack frames
// to ascend, with 0 identifying the caller of Caller.  The return values report the
// program counter, file name, and line number within the file of the corresponding
// call.  The boolean ok is false if it was not possible to recover the information.
func Caller(skip int) (pc uintptr, file string, line int, ok bool)

// Callers fills the slice pc with the program counters of function invocations
// on the calling goroutine's stack.  The argument skip is the number of stack frames
// to skip before recording in pc, with 0 starting at the caller of Callers.
// It returns the number of entries written to pc.
func Callers(skip int, pc []uintptr) int

type Func struct { // Keep in sync with runtime.h:struct Func
        name   string
        typ    string  // go type string
        src    string  // src file name
        pcln   []byte  // pc/ln tab for this func
        entry  uintptr // entry pc
        pc0    uintptr // starting pc, ln for table
        ln0    int32
        frame  int32 // stack frame size
        args   int32 // number of 32-bit in/out args
        locals int32 // number of 32-bit locals
}

// FuncForPC returns a *Func describing the function that contains the
// given program counter address, or else nil.
func FuncForPC(pc uintptr) *Func

// Name returns the name of the function.
func (f *Func) Name() string { return f.name }

// Entry returns the entry address of the function.
func (f *Func) Entry() uintptr { return f.entry }

// FileLine returns the file name and line number of the
// source code corresponding to the program counter pc.
// The result will not be accurate if pc is not a program
// counter within f.
func (f *Func) FileLine(pc uintptr) (file string, line int) {
        return funcline_go(f, pc)
}

// implemented in symtab.c
func funcline_go(*Func, uintptr) (string, int)

// mid returns the current os thread (m) id.
func mid() uint32

// Semacquire waits until *s > 0 and then atomically decrements it.
// It is intended as a simple sleep primitive for use by the synchronization
// library and should not be used directly.
func Semacquire(s *uint32)

// Semrelease atomically increments *s and notifies a waiting goroutine
// if one is blocked in Semacquire.
// It is intended as a simple wakeup primitive for use by the synchronization
// library and should not be used directly.
func Semrelease(s *uint32)

// SetFinalizer sets the finalizer associated with x to f.
// When the garbage collector finds an unreachable block
// with an associated finalizer, it clears the association and runs
// f(x) in a separate goroutine.  This makes x reachable again, but
// now without an associated finalizer.  Assuming that SetFinalizer
// is not called again, the next time the garbage collector sees
// that x is unreachable, it will free x.
//
// SetFinalizer(x, nil) clears any finalizer associated with x.
//
// The argument x must be a pointer to an object allocated by
// calling new or by taking the address of a composite literal.
// The argument f must be a function that takes a single argument
// of x's type and can have arbitrary ignored return values.
// If either of these is not true, SetFinalizer aborts the program.
//
// Finalizers are run in dependency order: if A points at B, both have
// finalizers, and they are otherwise unreachable, only the finalizer
// for A runs; once A is freed, the finalizer for B can run.
// If a cyclic structure includes a block with a finalizer, that
// cycle is not guaranteed to be garbage collected and the finalizer
// is not guaranteed to run, because there is no ordering that
// respects the dependencies.
//
// The finalizer for x is scheduled to run at some arbitrary time after
// x becomes unreachable.
// There is no guarantee that finalizers will run before a program exits,
// so typically they are useful only for releasing non-memory resources
// associated with an object during a long-running program.
// For example, an os.File object could use a finalizer to close the
// associated operating system file descriptor when a program discards
// an os.File without calling Close, but it would be a mistake
// to depend on a finalizer to flush an in-memory I/O buffer such as a
// bufio.Writer, because the buffer would not be flushed at program exit.
//
// A single goroutine runs all finalizers for a program, sequentially.
// If a finalizer must run for a long time, it should do so by starting
// a new goroutine.
func SetFinalizer(x, f interface{})

func getgoroot() string

// GOROOT returns the root of the Go tree.
// It uses the GOROOT environment variable, if set,
// or else the root used during the Go build.
func GOROOT() string {
        s := getgoroot()
        if s != "" {
                return s
        }
        return defaultGoroot
}

// Version returns the Go tree's version string.
// It is either a sequence number or, when possible,
// a release tag like "release.2010-03-04".
// A trailing + indicates that the tree had local modifications
// at the time of the build.
func Version() string {
        return theVersion
}

// GOOS is the Go tree's operating system target:
// one of darwin, freebsd, linux, and so on.
const GOOS string = theGoos

// GOARCH is the Go tree's architecture target:
// 386, amd64, or arm.
const GOARCH string = theGoarch