公开(公告)号：US10430577B2

公开(公告)日：2019-10-01

申请号：US14576692

申请日：2014-12-19

Applicant: Apple Inc.

Inventor： James Michael Magee ,  Russell A. Blaine ,  Vishal Patel ,  Daniel Andreas Steffen ,  Kevin James Van Vechten ,  Jacques Anthony Vidrine ,  Kelly B. Yancey ,  Jainam A. Shah

IPC: G06F21/44 ,  G06F9/50 ,  G06F21/62

Abstract: A method and an apparatus to dynamically distribute privileges among a plurality of processes are described. Each process may have attributes including a privilege to control access to processing resources. A first process may be running with a first privilege prohibited from access to a processing resource. A second process may be running with a second privilege allowed to access the processing resource. The first process may receive a request from the second process to perform a data processing task for the second process. In response, the second privilege may be dynamically transferred to the first process to allow the first process to access the processing resource. The first process may perform operations for the data processing task with the second privilege transferred from the second process.

公开(公告)号：US11940931B2

公开(公告)日：2024-03-26

申请号：US17141914

申请日：2021-01-05

Applicant: Apple Inc.

Inventor： Jainam A. Shah ,  Jeremy C. Andrus ,  Daniel A. Chimene ,  Kushal Dalmia ,  Pierre Habouzit ,  James M. Magee ,  Marina Sadini ,  Daniel A. Steffen

IPC: G06F9/52 ,  G06F9/48 ,  G06F9/50 ,  G06F9/54 ,  G06F12/14 ,  G06F12/0842

CPC classification number: G06F12/1466 ,  G06F9/4881 ,  G06F9/5038 ,  G06F9/52 ,  G06F9/526 ,  G06F9/541 ,  G06F9/545 ,  G06F12/0842 ,  G06F2209/5011

Abstract: A turnstile OS primitive is provided that enables support for owner tracking and waiting. The turnstile primitive enables a common framework that can be adopted across multiple different types of synchronization primitives to provide a common service for priority boosting and wait queuing. A turnstile can also provide a mechanism to enable a turnstile to block on another turnstile, allowing multi-hop priority boosting within a chain of multiple blocking turnstiles.

公开(公告)号：US20210157748A1

公开(公告)日：2021-05-27

申请号：US17141914

申请日：2021-01-05

Applicant: Apple Inc.

Inventor： Jainam A. Shah ,  Jeremy C. Andrus ,  Daniel A. Chimene ,  Kushal Dalmia ,  Pierre Habouzit ,  James M. Magee ,  Marina Sadini ,  Daniel A. Steffen

IPC: G06F12/14 ,  G06F9/48 ,  G06F9/52 ,  G06F9/50 ,  G06F9/54

Abstract: A turnstile OS primitive is provided that enables support for owner tracking and waiting. The turnstile primitive enables a common framework that can be adopted across multiple different types of synchronization primitives to provide a common service for priority boosting and wait queuing. A turnstile can also provide a mechanism to enable a turnstile to block on another turnstile, allowing multi-hop priority boosting within a chain of multiple blocking turnstiles.

公开(公告)号：US20180349181A1

公开(公告)日：2018-12-06

申请号：US15836411

申请日：2017-12-08

Applicant: Apple Inc.

Inventor： Daniel A. Steffen ,  Jainam A. Shah ,  James M. Magee ,  Jeremy C. Andrus ,  Russell A. Blaine

IPC: G06F9/48 ,  G06F9/52

CPC classification number: G06F9/4881 ,  G06F9/52 ,  G06F9/54

Abstract: Techniques are disclosed relating to inter-process communication. In some embodiments, a kernel receives a notification of a communication to be sent from a first thread of a first application to a second thread of a second application. The kernel provides a reply port to the first thread for receiving a reply to the communication from the second thread. The kernel facilitates sending the communication from the first thread to the second thread. The kernel increases an execution priority of the second thread in response to the kernel determining that the reply port and a destination port associated with the second thread are identified in the communication. In some embodiments, the kernel creates the reply port in response to receiving the notification and, in response to detecting the reply has been communicated to the reply port, decreases the execution priority of the second thread and removes the reply port.

公开(公告)号：US20150347743A1

公开(公告)日：2015-12-03

申请号：US14576692

申请日：2014-12-19

Applicant: Apple Inc.

Inventor： James Michael Magee ,  Russell A. Blaine ,  Vishal Patel ,  Daniel Andreas Steffen ,  Kevin James Van Vechten ,  Jacques Anthony Vidrine ,  Kelly B. Yancey ,  Jainam A. Shah

IPC: G06F21/44 ,  G06F9/50

CPC classification number: G06F21/44 ,  G06F9/468 ,  G06F21/62

Abstract: A method and an apparatus to dynamically distribute privileges among a plurality of processes are described. Each process may have attributes including a privilege to control access to processing resources. A first process may be running with a first privilege prohibited from access to a processing resource. A second process may be running with a second privilege allowed to access the processing resource. The first process may receive a request from the second process to perform a data processing task for the second process. In response, the second privilege may be dynamically transferred to the first process to allow the first process to access the processing resource. The first process may perform operations for the data processing task with the second privilege transferred from the second process.

Abstract translation: 描述了在多个处理之间动态分配特权的方法和装置。 每个进程可以具有包括控制对处理资源的访问的特权的属性。 第一进程可以以禁止访问处理资源的第一权限运行。 第二个进程可能正在运行，允许访问处理资源的第二个权限。 第一进程可以从第二进程接收对第二进程执行数据处理任务的请求。 作为响应，第二权限可以被动态地转移到第一进程以允许第一进程访问处理资源。 第一进程可以执行具有从第二进程传送的第二特权的数据处理任务的操作。

公开(公告)号：US10901920B2

公开(公告)日：2021-01-26

申请号：US16380300

申请日：2019-04-10

Applicant: Apple Inc.

Inventor： Jainam A. Shah ,  Jeremy C. Andrus ,  Daniel A. Chimene ,  Kushal Dalmia ,  Pierre Habouzit ,  James M. Magee ,  Marina Sadini ,  Daniel A. Steffen

IPC: G06F9/46 ,  G06F12/14 ,  G06F9/48 ,  G06F9/52 ,  G06F9/50 ,  G06F9/54 ,  G06F12/0842

Abstract: One embodiment provides for a computer-implemented method comprising instantiating a synchronization primitive to control access to a resource, acquiring the synchronization primitive at a first thread, the first thread having a first priority, associating a turnstile with the synchronization primitive, setting an inheritor of the turnstile to the first thread, attempting to acquire the synchronization primitive at a second thread while the synchronization primitive is held by the first thread, the second thread having a second priority, adding the second thread to a wait queue of the turnstile; and in response to determining that the second priority is higher than the first priority, increasing the priority of the first thread to the second priority.

公开(公告)号：US10671430B2

公开(公告)日：2020-06-02

申请号：US15836411

申请日：2017-12-08

Applicant: Apple Inc.

Inventor： Daniel A. Steffen ,  Jainam A. Shah ,  James M. Magee ,  Jeremy C. Andrus ,  Russell A. Blaine

IPC: G06F9/48 ,  G06F9/52 ,  G06F9/54

Abstract: Techniques are disclosed relating to inter-process communication. In some embodiments, a kernel receives a notification of a communication to be sent from a first thread of a first application to a second thread of a second application. The kernel provides a reply port to the first thread for receiving a reply to the communication from the second thread. The kernel facilitates sending the communication from the first thread to the second thread. The kernel increases an execution priority of the second thread in response to the kernel determining that the reply port and a destination port associated with the second thread are identified in the communication. In some embodiments, the kernel creates the reply port in response to receiving the notification and, in response to detecting the reply has been communicated to the reply port, decreases the execution priority of the second thread and removes the reply port.