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Hello, I am attempting to change the buffering of my output to line buffering instead of full buffering. I need this because I keep having problems with machines restarting which makes me lose data because it is all sitting in a buffer. I am trying to use setvbuf3f to accomplish this. I can...

Yes if there is a context switch int will not be set but that is the problem. If another thread then sets int to 1 and gets ready to write to the file the original thread can then come back and also set int to 1. Both threads will then have a lock on the file which is what the variable int is...

I am using the GNU compiler to compile my program. To make it multithreaded I have a multithreaded C++ program that calls fortran functions. Each C++ thread passes its fortran application an integer so that only one of the fortran functions will open a file at a time(they write several lines...

Is there a way to make a function/subroutine atomic? I am attempting to create mutex like structures within Fortran but for them to be proper I need to use atomic function calls.

I have found my problem. After hours of playing around with the code someone suggested that my problem may be from an array out of bounds problem. After compliling with -fbounds-check (wish I had heard of this before now) it turned out that that was the case. So the negation was probably...

I have played around with my code a lot and found a spot where I had changed how a calculation was done to increase efficiency which included a negative sign that was not in the original. The new equation still gives valid results, but they are different. I reverted the calculation to its...

Thanks for your help. That is very similar to what I am trying to do. I have been over the code several times and I can't see anything else wrong, but I guess I will keep looking.

UPDATE: I went back and removed all of the uses of IVECTOR (and not SPINVECTOR) and I have the same problem. Maybe the first run where the results did not change was a fluke.

I have defined two simple types in a module in Fortran 95. The types are defined as: TYPE :: SPINVECTOR DOUBLE PRECISION, dimension(0:3,1:3,1:3,1:3) :: x, y, z END TYPE SPINVECTOR TYPE :: IVECTOR integer :: x, y, z END TYPE IVECTOR I am then using these types to pass information from the...