‣ ChildProcess( ) | ( function ) |
‣ ChildProcess( arg ) | ( function ) |
This starts a GAP session as a child process and returns a stream to the child process. If no argument is given then the child process is created on the local machine; otherwise the argument should be:
1) \(arg\)="computer.ac.wales" the address of a remote computer for which ssh has been configured to require no password from the user;
(2) \(arg\)=["-m", "100000M", "-T"] a list of GAP command line options;
(3) \(arg\)="computer.ac.wales", ["-m", "100000M", "-T"] the address of a computer followed by a list of command line options.
(To configure ssh so that the user can login without a password prompt from "thishost" to "remotehost" either consult "man ssh" or
- open a shell on thishost
- cd .ssh
- ls
-> if id_dsa, id_rsa etc exists, skip the next two steps!
- ssh-keygen -t rsa
- ssh-keygen -t dsa
- scp *.pub userremotehost:~/
- ssh remotehost -l user
- cat id_rsa.pub >> .ssh/authorized_keys
- cat id_dsa.pub >> .ssh/authorized_keys
- rm id_rsa.pub id_dsa.pub
- exit
You should now be able to connect from "thishost" to "remotehost" without a password prompt.)
‣ ChildClose( s ) | ( function ) |
This closes the stream s to a child GAP process.
Examples: 1
‣ ChildCommand( str, s ) | ( function ) |
This runs a GAP command \(str\)="cmd;" on the child process accessed by the stream s. Here "cmd;" is a string representing the command.
‣ NextAvailableChild( L ) | ( function ) |
Inputs a list \(L\) of child processes and returns a child in \(L\) which is ready for computation (as soon as such a child is available).
‣ IsAvailableChild( s ) | ( function ) |
Inputs a child process \(s\) and returns true if s is currently available for computations, and false otherwise.
Examples: 1
‣ ChildPut( A, str, s ) | ( function ) |
This copies a GAP object A on the parent process to an object B=\(str\) on the child process s. (The copying relies on the function PrintObj(A); )
‣ ChildGet( str, s ) | ( function ) |
This functions copies a GAP object A="str" on the child process s and returns it on the parent process. (The copying relies on the function PrintObj(A); )
‣ HAPPrintTo( str, R ) | ( function ) |
Inputs a string \(str\)="file" giving the address of a new text file and a HAP object R. It writes the object R to "file". Currently this is only implemented for R equal to a resolution.
Examples: 1
‣ HAPRead( str, R ) | ( function ) |
Inputs an address \(str\)="file" of a file containing a HAP object R and returns the object. Currently this is only implemented for R equal to a resolution.
Examples: 1
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