SCO OpenServer 5

MPSTR_STPLOCK(D3str)

MPSTR_STPLOCK, MPSTR_STPRELE -- lock Stream head in multithreaded code

Synopsis (Not in DDI)

   #include stream.h
   
   MPSTR_STPLOCK(struct stdata *stp);
   	/* critical code section that accesses Stream head */
   MPSTR_STPRELE(struct stdata *stp, int s);

Description

The MPSTR_STPLOCK(D3str) and MPSTR_STPRELE(D3str) macros provide locks for critical code sections that access a Stream head.

Arguments

stp: the Stream head to be locked.
s: the spl(D3oddi) level, returned by the MPSTR_STPLOCK( ) function, to be restored by the MPSTR_STPRELE( ) function. If the value of s is set to -1, then MPSTR_STPRELE( ) does not restore the spl value; the driver must restore the spl value after the call to MPSTR_STPRELE( ) completes.

Usage

Context and synchronization

context

Hardware applicability

All

Version applicability

oddi: 3, 3mp, 4, 4mp, 5, 5mp, 6, 6mp

Differences between versions

References

lockb(D3oddi), MPSTR_QLOCK(D3str), sdistributed(D3oddi)

``ODDI driver interface version for SCO OpenServer 5'' in HDK Technical Reference