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| author | Quincey Koziol <koziol@hdfgroup.org> | 2001-09-04 21:22:29 (GMT) |
|---|---|---|
| committer | Quincey Koziol <koziol@hdfgroup.org> | 2001-09-04 21:22:29 (GMT) |
| commit | efda170169f7d61ab076ed49125282203bbcaa90 (patch) | |
| tree | 8aa49af63d3072f9ada198f2924d1a9fd3466adf /src/H5detect.c | |
| parent | dc5a388f8d2093cb7f43d6d93c9f6fb055fde58a (diff) | |
| download | hdf5-efda170169f7d61ab076ed49125282203bbcaa90.zip hdf5-efda170169f7d61ab076ed49125282203bbcaa90.tar.gz hdf5-efda170169f7d61ab076ed49125282203bbcaa90.tar.bz2 | |
[svn-r4423] Purpose:
Thread-safety Bug Fixes
Description:
FreeBSD must use a different layout or mechanism for allocating objects on
the stack when compiling for thread-safe operation. Unused bits in 'long
double' variable are never used ('long double's on FreeBSD are stored in
12 bytes, but only use 10 bytes for computations), but set to different
values, causing the endianness permutation testing to generate incorrect
results and eventually fail an assertion.
Solution:
Clear the temporary variables used for determining the endianness permutation
with memset (affecting all 12 bytes) instead of just assigning a 0.0 to them
(affecting only 10 bytes)
Platforms tested:
FreeBSD 4.4 (hawkwind)
Diffstat (limited to 'src/H5detect.c')
| -rw-r--r-- | src/H5detect.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/H5detect.c b/src/H5detect.c index c48e9a5..5955f23 100644 --- a/src/H5detect.c +++ b/src/H5detect.c @@ -203,6 +203,12 @@ precision (detected_t *d) INFO.varname = #VAR; \ INFO.size = sizeof(TYPE); \ \ + /* Completely initialize temporary variables, in case the bits used in */ \ + /* the type take less space than the number of bits used to store the type */ \ + memset(&_v3,0,sizeof(TYPE)); \ + memset(&_v2,0,sizeof(TYPE)); \ + memset(&_v1,0,sizeof(TYPE)); \ + \ /* Byte Order */ \ for (_i=0,_v1=0.0,_v2=1.0; _i<(signed)sizeof(TYPE); _i++) { \ _v3 = _v1; _v1 += _v2; _v2 /= 256.0; \ |