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「在此平臺上未實現64位NoBarrier_Store()」 我在win7上與vs2005一起使用tcmalloc。 在我的應用程序中有兩個線程,一個是malloc(),另一個是free(),當我的應用程序啓動時,tcmalloc會打印此文件。調試後,我發現以下functon無法在_WIN32上工作,64位NoBarrier_Store()未在此平臺上實現
// Return a suggested delay in nanoseconds for iteration number "loop"
static int SuggestedDelayNS(int loop) {
// Weak pseudo-random number generator to get some spread between threads
// when many are spinning.
static base::subtle::Atomic64 rand;
uint64 r = base::subtle::NoBarrier_Load(&rand);
r = 0x5deece66dLL * r + 0xb; // numbers from nrand48()
base::subtle::NoBarrier_Store(&rand, r);
r <<= 16; // 48-bit random number now in top 48-bits.
if (loop < 0 || loop > 32) { // limit loop to 0..32
loop = 32;
}
// loop>>3 cannot exceed 4 because loop cannot exceed 32.
// Select top 20..24 bits of lower 48 bits,
// giving approximately 0ms to 16ms.
// Mean is exponential in loop for first 32 iterations, then 8ms.
// The futex path multiplies this by 16, since we expect explicit wakeups
// almost always on that path.
return r >> (44 - (loop >> 3));
}
我想知道如何避免這在win32上。非常感謝。
是的,你是對的。 tcmalloc現在已經更新了svn。謝謝! – user1497861