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Apply the patch submitted by Joe Keane <jgk@jgk.org> to PR_Poll

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so that we use a struct pollfd array allocated on the stack
when caller's poll descriptor array can fit in it.  This avoids
the cost of a malloc and a free call when the poll descriptor
arrays are small.
This commit is contained in:
wtc%netscape.com 1998-12-07 01:39:48 +00:00
parent 002b73643a
commit 63c8ffe5f1
1 changed files with 18 additions and 7 deletions
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25
nsprpub/pr/src/pthreads/ptio.c
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@ -2875,14 +2875,25 @@ PR_IMPLEMENT(PRInt32) PR_Poll(
if (0 == npds) PR_Sleep(timeout);
else
{
#define STACK_POLL_DESC_COUNT 4
struct pollfd stack_syspoll[STACK_POLL_DESC_COUNT];
struct pollfd *syspoll;
PRIntn index, msecs;
struct pollfd *syspoll = NULL;
syspoll = (struct pollfd*)PR_MALLOC(npds * sizeof(struct pollfd));
if (NULL == syspoll)
if (npds <= STACK_POLL_DESC_COUNT)
{
PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
return -1;
syspoll = stack_syspoll;
}
else
{
syspoll = (struct pollfd*)PR_MALLOC(npds * sizeof(struct pollfd));
if (NULL == syspoll)
{
PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
return -1;
}
}
for (index = 0; index < npds; ++index)
{
PRInt16 in_flags_read = 0, in_flags_write = 0;
@ -3080,8 +3091,8 @@ retry:
}
}
PR_DELETE(syspoll);
if (syspoll != stack_syspoll)
PR_DELETE(syspoll);
}
return ready;