Elizabeth Anne Kon

US Patent:

6112222, Aug 29, 2000

Filed:

Aug 25, 1998

Appl. No.:

9/139816

Inventors:

Rama K. Govindaraju - Poughkeepsie NY
Elizabeth Anne Kon - Poughkeepsie NY
Robert Michael Straub - Poughkeepsie NY
William G. Tuel - Kingston NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 900

US Classification:

709102

Abstract:

Hybrid lock and unlock capabilities are provided for a threaded computing environment. For example, kernel locking services are selectively employed in conjunction with functions in the POSIX threads standard to provide a lock capability and an unlock capability. The hybrid approach determines which lock scheme to employ by evaluating whether one thread or multiple threads concurrently desire a resource lock. When only one thread desires the lock, the thread is directly assigned resource ownership employing one of an operating system primitive lock process or a hardware lock process. An alternate lock process is used to obtain resource ownership when multiple threads concurrently desire the lock. This alternate process employs at least one function in the POSIX threads standard to implement a queue of waiting threads. A similar hybrid approach to the unlock capability is also provided.

US Patent:

61050504, Aug 15, 2000

Filed:

Aug 25, 1998

Appl. No.:

9/139255

Inventors:

Rama K. Govindaraju - Poughkeepsie NY
Elizabeth Anne Kon - Poughkeepsie NY
Robert Michael Straub - Poughkeepsie NY
William G. Tuel - Kingston NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 900

US Classification:

709102

Abstract:

Hybrid lock and unlock capabilities are provided for a threaded computing environment. For example, kernel locking services are selectively employed in conjunction with functions in the POSIX threads standard to provide a lock capability and an unlock capability. The hybrid approach determines which lock scheme to employ by evaluating whether one thread or multiple threads concurrently desire a resource lock. When only one thread desires the lock, the thread is directly assigned resource ownership employing one of an operating system primitive lock process or a hardware lock process. An alternate lock process is used to obtain resource ownership when multiple threads concurrently desire the lock. This alternate process employs at least one function in the POSIX threads standard to implement a queue of waiting threads. A similar hybrid approach to the unlock capability is also provided.

US Patent:

61050490, Aug 15, 2000

Filed:

Aug 25, 1998

Appl. No.:

9/138996

Inventors:

Rama K. Govindaraju - Poughkeepsie NY
Elizabeth Anne Kon - Poughkeepsie NY
Robert Michael Straub - Poughkeepsie NY
William G. Tuel - Kingston NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 900

US Classification:

709102

Abstract:

Hybrid lock and unlock capabilities are provided for a threaded computing environment. For example, kernel locking services are selectively employed in conjunction with functions in the POSIX threads standard to provide a lock capability and an unlock capability. The hybrid approach determines which lock scheme to employ by evaluating whether one thread or multiple threads concurrently desire a resource lock. When only one thread desires the lock, the thread is directly assigned resource ownership employing one of an operating system primitive lock process or a hardware lock process. An alternate lock process is used to obtain resource ownership when multiple threads concurrently desire the lock. This alternate process employs at least one function in the POSIX threads standard to implement a queue of waiting threads. A similar hybrid approach to the unlock capability is also provided.