void mcs_rwlock::acquire_read()
{
/* attempt to CAS first. If no writers around, or no intervening
* add'l readers, we're done
*/
if(!attempt_read()) {
/* There seem to be writers around, or other readers intervened in our
* attempt_read() above.
* Join the queue and wait for them to leave
*/
{
CRITICAL_SECTION(cs, (parent_lock*) this);
_add_when_writer_leaves(READER);
}
membar_enter();
}
}
int main()
{
REPORT_START_CMPLT;
/* try reading/writing kernel memory */
attempt_read((int *)0x500000);
attempt_write((int *)0x500000);
/* try writing rodata section */
attempt_write((int *)array);
/* try writing text secion */
attempt_write((int *)main);
REPORT_END_SUCCESS;
exit(0);
}
