third_party/gperftools/src/tests/testutil.h

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// ---
// Author: Craig Silverstein

#ifndef TCMALLOC_TOOLS_TESTUTIL_H_
#define TCMALLOC_TOOLS_TESTUTIL_H_

// Run a function in a thread of its own and wait for it to finish.
// The function you pass in must have the signature
//    void MyFunction();
extern "C" void RunThread(void (*fn)());

// Run a function X times, in X threads, and wait for them all to finish.
// The function you pass in must have the signature
//    void MyFunction();
extern "C" void RunManyThreads(void (*fn)(), int count);

// The 'advanced' version: run a function X times, in X threads, and
// wait for them all to finish.  Give them all the specified stack-size.
// (If you're curious why this takes a stacksize and the others don't,
// it's because the one client of this fn wanted to specify stacksize. :-) )
// The function you pass in must have the signature
//    void MyFunction(int idx);
// where idx is the index of the thread (which of the X threads this is).
extern "C" void RunManyThreadsWithId(void (*fn)(int), int count, int stacksize);

// When compiled 64-bit and run on systems with swap several unittests will end
// up trying to consume all of RAM+swap, and that can take quite some time.  By
// limiting the address-space size we get sufficient coverage without blowing
// out job limits.
void SetTestResourceLimit();

static void (* volatile noopt_helper)(void *) = +[] (void* dummy) {};

// This function forces compiler to forget specific knowledge about
// value of 'val'. This is useful to avoid compiler optimizing out
// new/delete pairs for our unit tests.
template <typename T>
T noopt(T val) {
  noopt_helper(&val);
  return val;
}

#endif  // TCMALLOC_TOOLS_TESTUTIL_H_