Hello community, here is the log from the commit of package gperftools for openSUSE:Factory checked in at 2013-01-02 12:57:02 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Comparing /work/SRC/openSUSE:Factory/gperftools (Old) and /work/SRC/openSUSE:Factory/.gperftools.new (New) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Package is "gperftools", Maintainer is "" Changes: -------- --- /work/SRC/openSUSE:Factory/gperftools/gperftools.changes 2012-07-23 10:15:42.000000000 +0200 +++ /work/SRC/openSUSE:Factory/.gperftools.new/gperftools.changes 2013-01-02 12:57:04.000000000 +0100 @@ -1,0 +2,7 @@ +Thu Dec 27 11:08:09 UTC 2012 - [email protected] + +- spinlock-rand.patch fixes an issue encountered on PPC with + undefined conversions from 'base::subtle::Atomic64*' to 'const + volatile Atomic32*' + +------------------------------------------------------------------- New: ---- spinlock-rand.patch ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Other differences: ------------------ ++++++ gperftools.spec ++++++ --- /var/tmp/diff_new_pack.Oordj6/_old 2013-01-02 12:57:05.000000000 +0100 +++ /var/tmp/diff_new_pack.Oordj6/_new 2013-01-02 12:57:06.000000000 +0100 @@ -26,6 +26,7 @@ Patch12: %{name}_fix_unassigned_malloc_in_unittest.patch Patch14: %{name}_gcc46.patch Patch15: %{name}-glibc216.patch +Patch16: spinlock-rand.patch BuildRequires: autoconf BuildRequires: automake BuildRequires: gcc-c++ @@ -67,6 +68,7 @@ %patch12 -p1 %patch14 -p1 %patch15 -p1 +%patch16 -p1 %build autoreconf -fi ++++++ spinlock-rand.patch ++++++ diff --git a/src/base/spinlock_internal.cc b/src/base/spinlock_internal.cc index b9fadde..172a637 100644 --- a/src/base/spinlock_internal.cc +++ b/src/base/spinlock_internal.cc @@ -80,6 +80,7 @@ int32 SpinLockWait(volatile Atomic32 *w, int n, static int SuggestedDelayNS(int loop) { // Weak pseudo-random number generator to get some spread between threads // when many are spinning. +#ifdef BASE_HAS_ATOMIC64 static base::subtle::Atomic64 rand; uint64 r = base::subtle::NoBarrier_Load(&rand); r = 0x5deece66dLL * r + 0xb; // numbers from nrand48() @@ -96,6 +97,24 @@ static int SuggestedDelayNS(int loop) { // The futex path multiplies this by 16, since we expect explicit wakeups // almost always on that path. return r >> (44 - (loop >> 3)); +#else + static Atomic32 rand; + uint32 r = base::subtle::NoBarrier_Load(&rand); + r = 0x343fd * r + 0x269ec3; // numbers from MSVC++ + base::subtle::NoBarrier_Store(&rand, r); + + r <<= 1; // 31-bit random number now in top 31-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 31 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 >> (12 - (loop >> 3)); +#endif } } // namespace internal -- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
