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Annotation of coherent/a/usr/man/COHERENT/lock, revision 1.1.1.1

1.1       root        1: 
                      2: 
                      3: lock()                 COHERENT System Call                lock()
                      4: 
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                      7: 
                      8: Prevent process from swapping
                      9: 
                     10: lloocckk(_f_l_a_g)
                     11: iinntt _f_l_a_g;
                     12: 
                     13: The  COHERENT system  can swap  a process in  and out  of memory.
                     14: However, real-time response  sometimes requires that a process be
                     15: locked in memory.
                     16: 
                     17: When  called  with  a nonzero  flag,  lock  prevents the  calling
                     18: process from  swapping (unless  swapping is required  to increase
                     19: its memory  size).  Calling lock with a flag  of zero unlocks the
                     20: process.
                     21: 
                     22: This call  is restricted to  the superuser.  Processes  doing raw
                     23: I/O are automatically locked  into memory for the duration of the
                     24: I/O operation.
                     25: 
                     26: ***** See Also *****
                     27: 
                     28: COHERENT system calls, ps, swap
                     29: 
                     30: ***** Diagnostics *****
                     31: 
                     32: lock  returns zero  if it  performs the  indicated action  and -1
                     33: otherwise.  An error occurs if the caller is not the superuser.
                     34: 
                     35: ***** Notes *****
                     36: 
                     37: The existence of  several locked processes may cause memory frag-
                     38: mentation.   Therefore, all  locked processes  should  be created
                     39: just after  the system is booted, if  possible.  In general, lock
                     40: should be avoided if any alternative exists.
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                     64: COHERENT Lexicon                                           Page 1
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