Initializes the IMSL C Stat Library.

Synopsis

#include <imsls.h>

int imsls_initialize (int reason)

Required Arguments

int reason   (Input)
The reason why the call is being made.

 

1	The module is being loaded.
2	The current process is creating a new thread.
3	A thread is exiting.
4	The module is being unloaded.

 

Return Value

If the initialization succeeds a nonzero value is returned. If there is an error, zero is returned.

Description

This function is used to initialize the IMSL C Stat Library. It is not always required, but is always allowed.

This function is only required on Windows and only if the static version of the IMSL C Stat Library is being used.  It initializes the library for thread-safe usage.

If the IMSL library is linked into an EXE file, the library should be initialized by calling imsls_initialize before any other IMSL C Stat Library calls are made.

If the IMSL library is linked into a DLL file, the DLL must contain the DllMain callback function, which must call the function imsls_initialize. The function DllMain is an entry point into a DLL. Windows calls this function when it starts or terminates a process or a thread. It is also called when the DLL is loaded or unloaded using the LoadLibrary and FreeLibrary functions defined by Windows.

Examples

Example 1: Initializing an Application

In this example, the IMSL C Stat Library is initialized within an application. Often this is not required, but may be required if the static library version of the IMSL C Stat Library is linked into a Windows EXE. Even if not required, the initialization call is always allowed.

#include <imsl.h>

#include <stdio.h>

int main()

{

       float y;

       imsls_initialize(1);

 

       y = imsls_f_normal_cdf(0.5);

       printf("normal_cdf(0.5) = %g\n", y);

}

Output

normal_cdf(0.5) = 0.69462

Example 2: Linking IMSL into a DLL

If the static library version of the IMSL Stat Library is linked into a Windows DLL, the DLL must define the callback function DllMain. The function DllMain must in turn call imsls_initialize.

The following shows a simple implementation of DllMain. If the DLL requires additional initialization code, it can be added to DllMain.

#include <windows.h>

#include <stdio.h>

#include <imsl.h>

 

BOOL WINAPI DllMain(HINSTANCE hinstDLL,

               DWORD fdwReason, LPVOID lpvReserved)

{

       return imsls_initialize(fdwReason);

}

Visual Numerics, Inc. Visual Numerics - Developers of IMSL and PV-WAVE http://www.vni.com/ PHONE: 713.784.3131 FAX:713.781.9260