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HCOLL-333 Change for read and update, write and upgrade to come.

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This commit is contained in:
Peter Lawrey
2015-05-18 10:12:34 +01:00
parent 2ece3d9e98
commit 6c56813b5e
1 changed files with 57 additions and 4 deletions
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src/main/java/net/openhft/chronicle/hash/impl/BigSegmentHeader.java
+57 -4
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@@ -56,8 +56,9 @@ public final class BigSegmentHeader implements SegmentHeader {
static final long DELETED_OFFSET = EXCLUSIVE_LOCK_HOLDER_THREAD_ID_OFFSET + 8L;
private BigSegmentHeader() {}
private BigSegmentHeader() {
}
@Override
public long size(long address) {
return UNSAFE.getInt(address + SIZE_OFFSET) & UNSIGNED_INT_MASK;
@@ -232,7 +233,16 @@ public final class BigSegmentHeader implements SegmentHeader {
}
private boolean tryReadLock0(long address, long time, TimeUnit unit) {
long end = System.nanoTime() + unit.toNanos(time);
long timeInNanos = unit.toNanos(time);
if (timeInNanos < 2000000) {
return tryReadLockNanos(address, timeInNanos);
} else {
return tryReadLockMillis(address, (timeInNanos + 900000) / 1000000);
}
}
private boolean tryReadLockNanos(long address, long timeInNanos) {
long end = System.nanoTime() + timeInNanos;
do {
if (tryReadLock(address))
return true;
@@ -240,6 +250,23 @@ public final class BigSegmentHeader implements SegmentHeader {
return false;
}
/**
* Use a timer which is more insensitive to jumps in time like GCs and context switches.
*/
private boolean tryReadLockMillis(long address, long timeInMillis) {
long lastTime = System.currentTimeMillis();
do {
if (tryReadLock(address))
return true;
long now = System.currentTimeMillis();
if (now != lastTime) {
lastTime = now;
timeInMillis--;
}
} while (timeInMillis >= 0);
return false;
}
@Override
public boolean tryUpgradeReadToUpdateLock(long address) {
int countWord = getCountWord(address);
@@ -288,7 +315,16 @@ public final class BigSegmentHeader implements SegmentHeader {
}
private boolean tryUpdateLock0(long address, long time, TimeUnit unit) {
long end = System.nanoTime() + unit.toNanos(time);
long timeInNanos = unit.toNanos(time);
if (timeInNanos < 2000000) {
return tryUpdateLockNanos(address, timeInNanos);
} else {
return tryUpdateLockMillis(address, (timeInNanos + 900000) / 1000000);
}
}
private boolean tryUpdateLockNanos(long address, long timeInNanos) {
long end = System.nanoTime() + timeInNanos;
do {
if (tryUpdateLock(address))
return true;
@@ -296,6 +332,23 @@ public final class BigSegmentHeader implements SegmentHeader {
return false;
}
/**
* Use a timer which is more insensitive to jumps in time like GCs and context switches.
*/
private boolean tryUpdateLockMillis(long address, long timeInMillis) {
long lastTime = System.currentTimeMillis();
do {
if (tryUpdateLock(address))
return true;
long now = System.currentTimeMillis();
if (now != lastTime) {
lastTime = now;
timeInMillis--;
}
} while (timeInMillis >= 0);
return false;
}
@Override
public void writeLock(long address) {
if (!tryWriteLock(address, 2, TimeUnit.SECONDS)) {