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Log long periods of holding write index lock.

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This commit is contained in:
Sergey Prigogin 2009-10-17 20:15:16 +00:00
parent 4cf3daa620
commit f339b83aa5
1 changed files with 12 additions and 3 deletions
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15
core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/PDOM.java
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@ -94,7 +94,8 @@ import org.eclipse.core.runtime.Status;
* Database for storing semantic information for one project.
*/
public class PDOM extends PlatformObject implements IPDOM {
private static final int BLOCKED_WRITELOCK_OUTPUT_INTERVAL = 30000;
private static final int BLOCKED_WRITE_LOCK_OUTPUT_INTERVAL = 30000;
private static final int LONG_WRITE_LOCK_REPORT_THRESHOLD = 1000;
static boolean sDEBUG_LOCKS= false; // initialized in the PDOMManager, because IBM needs PDOM independent of runtime plugin.
/**
@ -715,6 +716,7 @@ public class PDOM extends PlatformObject implements IPDOM {
private int waitingReaders;
private long lastWriteAccess= 0;
private long lastReadAccess= 0;
private long timeWriteLockAcquired;
public void acquireReadLock() throws InterruptedException {
@ -793,12 +795,14 @@ public class PDOM extends PlatformObject implements IPDOM {
// Let the readers go first
long start= sDEBUG_LOCKS ? System.currentTimeMillis() : 0;
while (lockCount > giveupReadLocks || waitingReaders > 0) {
mutex.wait(BLOCKED_WRITELOCK_OUTPUT_INTERVAL);
mutex.wait(BLOCKED_WRITE_LOCK_OUTPUT_INTERVAL);
if (sDEBUG_LOCKS) {
start = reportBlockedWriteLock(start, giveupReadLocks);
}
}
lockCount= -1;
if (sDEBUG_LOCKS)
timeWriteLockAcquired = System.currentTimeMillis();
db.setExclusiveLock();
}
}
@ -807,6 +811,7 @@ public class PDOM extends PlatformObject implements IPDOM {
releaseWriteLock(0, true);
}
@SuppressWarnings("nls")
public void releaseWriteLock(int establishReadLocks, boolean flush) {
clearResultCache();
try {
@ -820,6 +825,10 @@ public class PDOM extends PlatformObject implements IPDOM {
fEvent= new ChangeEvent();
synchronized (mutex) {
if (sDEBUG_LOCKS) {
long timeHeld = lastWriteAccess - timeWriteLockAcquired;
if (timeHeld >= LONG_WRITE_LOCK_REPORT_THRESHOLD) {
System.out.println("Index write lock held for " + timeHeld + " ms");
}
decWriteLock(establishReadLocks);
}
@ -1371,7 +1380,7 @@ public class PDOM extends PlatformObject implements IPDOM {
@SuppressWarnings("nls")
private long reportBlockedWriteLock(long start, int giveupReadLocks) {
long now= System.currentTimeMillis();
if (now >= start+BLOCKED_WRITELOCK_OUTPUT_INTERVAL) {
if (now >= start + BLOCKED_WRITE_LOCK_OUTPUT_INTERVAL) {
System.out.println();
System.out.println("Blocked writeLock");
System.out.println(" lockcount= " + lockCount + ", giveupReadLocks=" + giveupReadLocks + ", waitingReaders=" + waitingReaders);