Systems and methods for suspending and resuming threads

Details Systems and methods for suspending and resuming threads Systems and methods for suspending and resuming threads

2011-08-09

2011-08-09

Nguyen, Van H (Department: 2196)

Electrical computers and digital processing systems: virtual mac

Task management or control

Process scheduling

C707S620000, C707S624000, C707S704000, C710S108000, C710S200000

Reexamination Certificate

active

07996848

ABSTRACT:
In a methods and systems of controlling a process's access to a device driver, a lock may be used to establish a process wait state or to wake up one or more processes. A spinlock may be used to acquire a lock associated with a device driver. The lock includes a lock value representing the availability of the lock. If the lock value is a first value, the process acquires the lock and sets the lock value to a second value. Otherwise, the process returns to the step of using the spinlock to acquire the lock associated with the device driver. If the lock is acquired, the process accesses the device driver. If the device is not ready, the process is set to wait for the lock. Waiting for the lock comprises setting a field of the process to a pointer to the lock and setting a state of the process to waiting. After the device has been successfully accessed or the process has been set to wait for the lock, the lock is released typically by setting the lock value to the first value.

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