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Spawn in computing refers to a function that loads and executes a new child process. The current process may wait for the child to terminate or may continue to execute concurrent computing . Creating a new subprocess requires enough memory in which both the child process and the current program can execute.
The exec calls named ending with an e alter the environment for the new process image by passing a list of environment settings through the envp argument. This argument is an array of character pointers; each element (except for the final element) points to a null-terminated string defining an environment variable .
The spawn() family of functions declared in process.h can replace it in cases where the call to fork() is followed directly by exec(). When a fork syscall is made on WSL , lxss.sys does some of the initial work to prepare for copying the process.
OS/360 and successors, and VS/9, mainframe operating systems none No No No No No Yes Yes No No GOFF: IBM MVS and z/OS mainframe operating systems none No No Yes No Yes Yes Yes No No a.out: Unix-like: none No No No No Yes [8] Yes [8] Extension No No COFF: Unix-like: none Yes by file Yes No No Yes Yes Extension No No ECOFF: Ultrix, Tru64 UNIX ...
Each processor that has a current thread to execute, executes the instructions in the thread one by one, until it encounters an instruction that causes one of four "special" behaviors: [2]: 10 A spawn instruction causes a new thread to be created. The current thread is placed at the bottom of the deque, and the processor starts executing the ...
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Implementations of the fork–join model will typically fork tasks, fibers or lightweight threads, not operating-system-level "heavyweight" threads or processes, and use a thread pool to execute these tasks: the fork primitive allows the programmer to specify potential parallelism, which the implementation then maps onto actual parallel execution. [1]
exec: cgi or cmd This directive executes a program, script, or shell command on the server. The cmd parameter specifies a server-side command; the cgi parameter specifies the path to a CGI script. The PATH_INFO and QUERY_STRING of the current SSI script will be passed to the CGI script, as a result "exec cgi" should be used instead of "include ...