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** For MacOSX only **

This directory contains 2 programs :

  • dump_shared_mem: view content of shared memory.
  • reset_shared_mem: erase all stored datas of shared memory.

the make_all.sh batch builds these 2 programs.

dump_shm.

dump_shm tries to connect to the shared memory only if its exists. This program doesn't use synchronization primitive to read the shared memory. To quit this program, press Ctrl+C.

dump_shm -1 300

Executes this program forever, and check all 300 us if shared memory changes.

When there are changes in the shared memory (only about sempahore count), program prints the new content of shared memory as below:

==========
Tue Feb 25 17:04:05 2025

dump_shm_semlock_counters
header:0x1022b4000 - counter array:0x1022b4010
n sems:2 - n sem_slots:87551, n procs:1, size_shm:2801664
p:0x1022b4010, n:/mp-fwl20ahw, v:6, r:0, t:Tue Feb 25 17:04:05 2025
p:0x1022b4030, n:/mp-z3635cdr, v:6, r:0, t:Tue Feb 25 17:04:04 2025

reset_shm.

reset_shm tries to connect to the shared memory only if its exists. This program uses synchronization primitive to read the shared memory.

When exits, this program calls shm_unlink.