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(class basic_string::Rep): Make release member function thread-safe for

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ix86 (x>=4) and UltraSPARC.

From-SVN: r26820
This commit is contained in:
Ulrich Drepper 1999-05-07 10:16:09 +00:00
parent 199343c591
commit 4ff8ec301f
1 changed files with 27 additions and 0 deletions
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27
libstdc++/std/bastring.h
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@ -73,7 +73,34 @@ private:
charT* data () { return reinterpret_cast<charT *>(this + 1); } charT* data () { return reinterpret_cast<charT *>(this + 1); }
charT& operator[] (size_t s) { return data () [s]; } charT& operator[] (size_t s) { return data () [s]; }
charT* grab () { if (selfish) return clone (); ++ref; return data (); } charT* grab () { if (selfish) return clone (); ++ref; return data (); }
#if defined __i486__ || defined __i586__ || defined __i686__
void release ()
{
size_t __val;
asm ("lock; xaddl %0, %2"
: "=r" (__val) : "0" (-1), "m" (ref) : "memory");
if (__val == 1)
delete this;
}
#elif defined __sparcv9__
void release ()
{
size_t __newval, __oldval = ref;
do
{
__newval = __oldval - 1;
__asm__ ("cas [%4], %2, %0"
: "=r" (__oldval), "=m" (ref)
: "r" (__oldval), "m" (ref), "r"(&(ref)), "0" (__newval));
}
while (__newval != __oldval);
if (__oldval == 0)
delete this;
}
#else
void release () { if (--ref == 0) delete this; } void release () { if (--ref == 0) delete this; }
#endif
inline static void * operator new (size_t, size_t); inline static void * operator new (size_t, size_t);
inline static void operator delete (void *); inline static void operator delete (void *);