TSRs rely on this ability to have multiple processes in memory at once.īy contrast, some other operating systems, for example CP/M-80 1.x and 2.x, only supported loading one program into memory at a time, and had no support for spawning subprocesses. (Not entirely suspended, because a child process can call back to a parent process – most commonly by invoking software interrupts for which the parent process has installed handlers.) While only one process can be executing in the foreground at a time, multiple processes can coexist in memory. Processes can spawn sub-processes, albeit the parent process is mostly suspended while the child process runs. In MS-DOS, each PSP segment is arguably a process. I don't know if that statement is quite true. specifically, it had no "process management" no concept of "processes" at all, in fact.
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