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runtime: put lockorder before pollorder in Select memory block.

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Otherwise lockorder may be misaligned, since lockorder is a
list of pointers and pollorder is a list of uint16.
Discovered running gccgo (which uses a modified copy of this
code) on SPARC.

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5655054
This commit is contained in:
Ian Lance Taylor 2012-02-10 21:24:14 -08:00
parent f91cc3bdbb
commit 53e139c7a0
1 changed files with 6 additions and 2 deletions
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8
src/pkg/runtime/chan.c
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@ -586,6 +586,10 @@ newselect(int32 size, Select **selp)
if(size > 1)
n = size-1;
// allocate all the memory we need in a single allocation
// start with Select with size cases
// then lockorder with size entries
// then pollorder with size entries
sel = runtime·mal(sizeof(*sel) +
n*sizeof(sel->scase[0]) +
size*sizeof(sel->lockorder[0]) +
@ -593,8 +597,8 @@ newselect(int32 size, Select **selp)
sel->tcase = size;
sel->ncase = 0;
sel->pollorder = (void*)(sel->scase + size);
sel->lockorder = (void*)(sel->pollorder + size);
sel->lockorder = (void*)(sel->scase + size);
sel->pollorder = (void*)(sel->lockorder + size);
*selp = sel;
if(debug)