valgrid suppress struct pack nanosleep

Author: scivision

README.md

@@ -93,10 +93,18 @@ GCC ≥ 9 and Intel oneAPI have ISO_Fortran_binding.h
 
 ## Notes
 
+### struct memory alignment
+
+Some examples use scalar C struct.
+ISO_C_BINDING handles mapping struct to/from Fortran TYPE.
+For arrays of struct, compiler
+[pragma may be needed](https://stackoverflow.com/questions/53161673/data-alignment-inside-a-structure-in-intel-fortran).
+
+Valgrind needed suppression to avoid memory alignment (uninitialized memory) warnings for C struct input to nanosleep.
 ### MacOS
 
 For MacOS with Apple's Clang and Homebrew GCC,
-it MAY be needed to have in ~/.zprofile like the following:
+it MAY be needed to have in ~/.zshrc like the following:
 (check directory / versions on your Mac)
 
 ```sh

memcheck.cmake

@@ -89,6 +89,7 @@ INCLUDE ${include}
 INCLUDE_LABEL ${include_label}
 EXCLUDE ${exclude}
 EXCLUDE_LABEL ${exclude_label}
+PARALLEL_LEVEL ${Ncpu}
 RETURN_VALUE ret
 CAPTURE_CMAKE_ERROR err
 DEFECT_COUNT count

src/sleep/reference/posix_nanosleep.f90

@@ -1,4 +1,5 @@
 module sleep_std
+!! https://man7.org/linux/man-pages/man2/nanosleep.2.html
 use, intrinsic :: iso_c_binding, only : C_INT, C_LONG
 implicit none
 

valgrind.supp

@@ -6,3 +6,12 @@
    fun:objconstruct_C
    fun:main
 }
+{
+   nanosleep-isinit-req
+   Memcheck:Param
+   nanosleep(req)
+   fun:nanosleep
+   fun:__sleep_std_MOD_sleep_ms
+   fun:MAIN__
+   fun:main
+}