go/src/runtime/tracecpu.go

// traceInitReadCPU initializes CPU profile -> tracer state for tracing.
//
// Returns a profBuf for reading from.
func traceInitReadCPU() { … }

// traceStartReadCPU creates a goroutine to start reading CPU profile
// data into an active trace.
//
// traceAdvanceSema must be held.
func traceStartReadCPU() { … }

// traceStopReadCPU blocks until the trace CPU reading goroutine exits.
//
// traceAdvanceSema must be held, and tracing must be disabled.
func traceStopReadCPU() { … }

// traceReadCPU attempts to read from the provided profBuf[gen%2] and write
// into the trace. Returns true if there might be more to read or false
// if the profBuf is closed or the caller should otherwise stop reading.
//
// The caller is responsible for ensuring that gen does not change. Either
// the caller must be in a traceAcquire/traceRelease block, or must be calling
// with traceAdvanceSema held.
//
// No more than one goroutine may be in traceReadCPU for the same
// profBuf at a time.
//
// Must not run on the system stack because profBuf.read performs race
// operations.
func traceReadCPU(gen uintptr) bool { … }

// traceCPUFlush flushes trace.cpuBuf[gen%2]. The caller must be certain that gen
// has completed and that there are no more writers to it.
func traceCPUFlush(gen uintptr) { … }

// traceCPUSample writes a CPU profile sample stack to the execution tracer's
// profiling buffer. It is called from a signal handler, so is limited in what
// it can do. mp must be the thread that is currently stopped in a signal.
func traceCPUSample(gp *g, mp *m, pp *p, stk []uintptr) { … }