Abstract: Exemplary methods, apparatuses, and systems generate a graphical user interface (GUI) including a plurality of selectable elements. Selections of an application and a first filter within the GUI configure the promotion to be displayed to a subset of a selected group of users, the subset being users that access the network service using a user device that both runs the selected application and meets user device state criteria defined by the selected first filter. A request corresponding to the first filter is transmitted to a user device detected to be running the selected application and associated with the selected group of users. When the user device is determined to satisfy the user device state criteria, the promotion is transmitted to the user device.

Abstract: Exemplary methods, apparatuses, and systems generate a graphical user interface (GUI) including a plurality of selectable elements. Selections of an application and a first filter within the GUI configure the promotion to be displayed to a subset of a selected group of users, the subset being users that access the network service using a user device that both runs the selected application and meets user device state criteria defined by the selected first filter. A request corresponding to the first filter is transmitted to a user device detected to be running the selected application and associated with the selected group of users. When the user device is determined to satisfy the user device state criteria, the promotion is transmitted to the user device.

Abstract: Multiple virtual processes are each associated with a unique virtual process identifier. For each virtual process, a separate initialization process is started, from which all other processes included in the virtual process originate. The initialization process is associated with the appropriate virtual process identifier. System calls that create new processes are intercepted, and created processes are associated with the virtual process identifier of the appropriate initialization process. Multiple virtual processes are provided on a single, physical computer system.

Abstract: An I/O multiplexing operation involving a cross-domain file descriptor set is intercepted. The cross-domain set is divided into a first subset corresponding to a first file type and a second subset corresponding to a second file type. System calls are initiated in parallel for performing separate I/O multiplexing operations on the first and second subsets of file descriptors. In response to one of the parallel system calls identifying at least one file descriptor ready for communication, the other parallel system call is unblocked. Sets of file descriptors identified as ready for communication by the parallel system calls are combined and returned to a calling process.

Abstract: File descriptors associated with specific file types are disambiguated from other file descriptors by maintaining and examining an indicator table containing indicators concerning file descriptors associated with a specific, desired file type. System calls that establish a descriptor of the specific, desired type are intercepted, and an indicator concerning the established file descriptor is added to the indicator table. To keep the indicator table current, system calls that make a copy of a file descriptor or that delete a file descriptor are intercepted. If a file descriptor associated with the desired type is copied or deleted, the indicator table is updated. Therefore, the indicator table preferably includes indicators concerning all file descriptors associated with files of the specific desired type. The indicator table is examined to determine whether or not a specific file descriptor is of the desired type.