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Annotation of coherent/f/usr/man/KERNEL/defer, revision 1.1.1.1

1.1       root        1: ddeeffeerr() -- Accessible Kernel Routine
                      2: 
                      3: vvooiidd
                      4: ddeeffeerr(_f_u_n_c, _a_r_g)
                      5: vvooiidd (*_f_u_n_c)();
                      6: cchhaarr *_a_r_g;
                      7: 
                      8: ddeeffeerr() defers execution of  function _f_u_n_c with argument _a_r_g.  Execution of
                      9: _f_u_n_c remains deferred until the next context switch, transition from kernel
                     10: to user mode, or invocation of the function ddeeffeenndd.
                     11: 
                     12: Deferred functions  should never call  sleep or access the  uu area, because
                     13: the kernel  can switch  uu areas  as part of  context switching.  Up  to 127
                     14: functions can be  deferred at any one time.  Exceeding  this limit may lose
                     15: all deferred functions.
                     16: 
                     17: ddeeffeerr()  is  normally  used  to  minimize  interrupt latency  by  deferring
                     18: operations  from  interrupt  level,  where  lower priority  interrupts  are
                     19: disabled, to  background level, where all  interrupts are normally enabled.
                     20: It is also useful in eliminating critical race conditions between task- and
                     21: interrupt-related   operations,    because   deferred   functions   execute
                     22: synchronously with each other, with timed functions, and with system calls.
                     23: 
                     24: _S_e_e _A_l_s_o
                     25: aacccceessssiibbllee kkeerrnneell rroouuttiinneess

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