Assignment #5, Spring 2004
Pseudo code for part A
File p51.cpp:
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// char *sts[N]; // Out-comment the old definition of the status table
Create shared memory for the new status table:
HANDLE smh = (HANDLE) 0xffffffff;
HANDLE mh = CreateFileMapping(smh,0,PAGE_READWRITE,0,15,"status");
char *sts = (char *) MapViewOfFile(mh,FILE_MAP_WRITE,0,0,0);
A challenge: How can you check the status of successful/unsuccessful execution
of the system calls in file scope?
void main()
{
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Create child process s51 (the server)
(Use STARTUPINFO si to force s51 to use the same standard output as p51)
CreateProcess("s51.exe",......&si, &pi)
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TerminateProcess (pi.hProcess,1); // Terminate the server when finished
}
void Turtle(DWORD id)
{ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
char *p = sts +id*3; // Status for this turtle (shared memory)
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strncpy(p," R",3); // Set status variable to the current status string
// (access shared memory)
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}
void Boat(void)
{. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .}
