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Code Issues

Fixed bug CORE-2444 : When more than one attachment register interests in events simultaneously and free space in events table is exhausted engine could hung

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This commit is contained in:
hvlad 2009-04-30 07:07:43 +00:00
parent f13220dab2
commit 967958d303
1 changed files with 21 additions and 3 deletions
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24
src/jrd/event.cpp
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@ -553,6 +553,10 @@ evh* EventManager::acquire_shmem()
m_header->evh_current_process = m_processOffset; m_header->evh_current_process = m_processOffset;
// hvlad: condition below never can be true and we change evh_length
// after remapping only. Also code below looks not complete, compare
// it with remapping code in alloc_global
/***
if (m_header->evh_length > m_shmemData.sh_mem_length_mapped) if (m_header->evh_length > m_shmemData.sh_mem_length_mapped)
{ {
const ULONG length = m_header->evh_length; const ULONG length = m_header->evh_length;
@ -598,7 +602,7 @@ evh* EventManager::acquire_shmem()
process->prb_flags &= ~PRB_remap_over; process->prb_flags &= ~PRB_remap_over;
#endif #endif
} }
***/
return m_header; return m_header;
} }
@ -622,6 +626,20 @@ frb* EventManager::alloc_global(UCHAR type, ULONG length, bool recurse)
length = FB_ALIGN(length, FB_ALIGNMENT); length = FB_ALIGN(length, FB_ALIGNMENT);
SRQ_PTR* best = NULL; SRQ_PTR* best = NULL;
#if (defined HAVE_MMAP || defined WIN_NT)
// hvlad: wait for end of shared memory remapping if it is in progress
prb* process = (prb*) SRQ_ABS_PTR(m_processOffset);
while (process->prb_flags & (PRB_remap | PRB_remap_over))
{
release_shmem();
THREAD_YIELD();
acquire_shmem();
process = (prb*) SRQ_ABS_PTR(m_processOffset);
}
#endif
for (ptr = &m_header->evh_free; (free = (frb*) SRQ_ABS_PTR(*ptr)) && *ptr; for (ptr = &m_header->evh_free; (free = (frb*) SRQ_ABS_PTR(*ptr)) && *ptr;
ptr = &free->frb_next) ptr = &free->frb_next)
{ {
@ -642,7 +660,7 @@ frb* EventManager::alloc_global(UCHAR type, ULONG length, bool recurse)
// Before remapping the memory, wakeup the watcher thread. // Before remapping the memory, wakeup the watcher thread.
// Then remap the shared memory and allow the watcher thread to remap. // Then remap the shared memory and allow the watcher thread to remap.
prb* process = (prb*) SRQ_ABS_PTR(m_processOffset); process = (prb*) SRQ_ABS_PTR(m_processOffset);
process->prb_flags |= PRB_remap; process->prb_flags |= PRB_remap;
post_process(process); post_process(process);
@ -1467,7 +1485,7 @@ void EventManager::watcher_thread()
process->prb_flags &= ~PRB_wakeup; process->prb_flags &= ~PRB_wakeup;
#if (defined HAVE_MMAP || defined WIN_NT) #if (defined HAVE_MMAP || defined WIN_NT)
if (process->prb_flags & PRB_remap) while (process->prb_flags & PRB_remap)
{ {
process->prb_flags |= PRB_remap_over; process->prb_flags |= PRB_remap_over;
process->prb_flags &= ~PRB_remap; process->prb_flags &= ~PRB_remap;