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8009062: poor performance of JNI AttachCurrentThread after fix for 7017193

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Don't re-evaluate stack bounds for main thread before install guard page

Reviewed-by: coleenp, dholmes, dlong
This commit is contained in:
Dmitry Samersoff 2013-08-29 21:48:23 +04:00
parent 1ff22f2ed9
commit 98c327bc7d
6 changed files with 256 additions and 89 deletions
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38
hotspot/src/share/vm/runtime/os.cpp
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@ -1424,44 +1424,6 @@ bool os::is_server_class_machine() {
return result;
}
// Read file line by line, if line is longer than bsize,
// skip rest of line.
int os::get_line_chars(int fd, char* buf, const size_t bsize){
size_t sz, i = 0;
// read until EOF, EOL or buf is full
while ((sz = (int) read(fd, &buf[i], 1)) == 1 && i < (bsize-2) && buf[i] != '\n') {
++i;
}
if (buf[i] == '\n') {
// EOL reached so ignore EOL character and return
buf[i] = 0;
return (int) i;
}
buf[i+1] = 0;
if (sz != 1) {
// EOF reached. if we read chars before EOF return them and
// return EOF on next call otherwise return EOF
return (i == 0) ? -1 : (int) i;
}
// line is longer than size of buf, skip to EOL
char ch;
while (read(fd, &ch, 1) == 1 && ch != '\n') {
// Do nothing
}
// return initial part of line that fits in buf.
// If we reached EOF, it will be returned on next call.
return (int) i;
}
void os::SuspendedThreadTask::run() {
assert(Threads_lock->owned_by_self() || (_thread == VMThread::vm_thread()), "must have threads lock to call this");
internal_do_task();