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Diffstat (limited to 'src/runtime/debug.go')
-rw-r--r-- | src/runtime/debug.go | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/src/runtime/debug.go b/src/runtime/debug.go new file mode 100644 index 000000000..4414dd55d --- /dev/null +++ b/src/runtime/debug.go @@ -0,0 +1,70 @@ +// 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 + +import "unsafe" + +// Breakpoint executes a breakpoint trap. +func Breakpoint() + +// LockOSThread wires the calling goroutine to its current operating system thread. +// Until the calling goroutine exits or calls UnlockOSThread, it will always +// execute in that thread, and no other goroutine can. +func LockOSThread() + +// UnlockOSThread unwires the calling goroutine from its fixed operating system thread. +// If the calling goroutine has not called LockOSThread, UnlockOSThread is a no-op. +func UnlockOSThread() + +// GOMAXPROCS sets the maximum number of CPUs that can be executing +// simultaneously and returns the previous setting. If n < 1, it does not +// change the current setting. +// The number of logical CPUs on the local machine can be queried with NumCPU. +// This call will go away when the scheduler improves. +func GOMAXPROCS(n int) int { + if n > _MaxGomaxprocs { + n = _MaxGomaxprocs + } + lock(&sched.lock) + ret := int(gomaxprocs) + unlock(&sched.lock) + if n <= 0 || n == ret { + return ret + } + + semacquire(&worldsema, false) + gp := getg() + gp.m.gcing = 1 + onM(stoptheworld) + + // newprocs will be processed by starttheworld + newprocs = int32(n) + + gp.m.gcing = 0 + semrelease(&worldsema) + onM(starttheworld) + return ret +} + +// NumCPU returns the number of logical CPUs on the local machine. +func NumCPU() int { + return int(ncpu) +} + +// NumCgoCall returns the number of cgo calls made by the current process. +func NumCgoCall() int64 { + var n int64 + for mp := (*m)(atomicloadp(unsafe.Pointer(&allm))); mp != nil; mp = mp.alllink { + n += int64(mp.ncgocall) + } + return n +} + +// NumGoroutine returns the number of goroutines that currently exist. +func NumGoroutine() int { + return int(gcount()) +} + +func gcount() int32 |