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java/Prequest: keep a pointer to the buffer #815

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10 changes: 5 additions & 5 deletions ompi/mpi/java/java/Comm.java
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Original file line number Diff line number Diff line change
Expand Up @@ -769,7 +769,7 @@ public final Prequest sendInit(Buffer buf, int count,
{
MPI.check();
assertDirectBuffer(buf);
return new Prequest(sendInit(handle, buf, count, type.handle, dest, tag));
return new Prequest(sendInit(handle, buf, count, type.handle, dest, tag), buf);
}

private native long sendInit(
Expand All @@ -794,7 +794,7 @@ public final Prequest bSendInit(Buffer buf, int count,
{
MPI.check();
assertDirectBuffer(buf);
return new Prequest(bSendInit(handle, buf, count, type.handle, dest, tag));
return new Prequest(bSendInit(handle, buf, count, type.handle, dest, tag), buf);
}

private native long bSendInit(
Expand All @@ -819,7 +819,7 @@ public final Prequest sSendInit(Buffer buf, int count,
{
MPI.check();
assertDirectBuffer(buf);
return new Prequest(sSendInit(handle, buf, count, type.handle, dest, tag));
return new Prequest(sSendInit(handle, buf, count, type.handle, dest, tag), buf);
}

private native long sSendInit(
Expand All @@ -844,7 +844,7 @@ public final Prequest rSendInit(Buffer buf, int count,
{
MPI.check();
assertDirectBuffer(buf);
return new Prequest(rSendInit(handle, buf, count, type.handle, dest, tag));
return new Prequest(rSendInit(handle, buf, count, type.handle, dest, tag), buf);
}

private native long rSendInit(
Expand All @@ -869,7 +869,7 @@ public final Prequest recvInit(Buffer buf, int count,
{
MPI.check();
assertDirectBuffer(buf);
return new Prequest(recvInit(handle, buf, count, type.handle, source, tag));
return new Prequest(recvInit(handle, buf, count, type.handle, source, tag), buf);
}

private native long recvInit(
Expand Down
14 changes: 13 additions & 1 deletion ompi/mpi/java/java/Prequest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,8 @@
* All rights reserved.
* Copyright (c) 2015 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2015 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
Expand Down Expand Up @@ -47,18 +49,28 @@

package mpi;

import java.nio.Buffer;

/**
* Persistent request object.
*/
public final class Prequest extends Request
{
/**
* Buffer used internally by the persistent request
* maintain a pointer to the buffer to ensure it
* cannot be free'd by the garbage collector
*/
private Buffer buffer;

/**
* Constructor used by {@code sendInit}, etc.
* @param handle Handle for the Prequest object
*/
protected Prequest(long handle)
protected Prequest(long handle, Buffer buffer)
{
super(handle);
this.buffer = buffer;
}

/**
Expand Down