forums.silverfrost.com

[MarzAttax]

Hi there,

I am attempting to write some code that is Multi-Threaded.

If I have a function named Thread1 say that has the line:

Call READF@(ptrDataP, i2HandleP, iNumBytesToReadP, iNumBytesReadP, i2ErrorL)

and another function named Thread2 say that has the line:

Call READF@(ptrDataP, i2HandleP, iNumBytesToReadP, iNumBytesReadP, i2ErrorL)

Where ptrDataP, i2HandleP, iNumBytesToReadP, iNumBytesReadP, i2ErrorL are different memory locations and with i2HandleP different handles for both, then if a Thread calls Thread1 and a different Thread calls Thread2,
will there be a conflict?

I ask this because READF@ might be the same code called by each Thread and/or might not be Thread-safe and/or using "locks"

I also need to know this for:

CURDIR@
MKDIR@
FILE_SIZE@
OPENF@
WRITEF@
READF@
CLOSEF@
Inquire

Regards
Marz

[PaulLaidler]

The programmer must apply any required locks.
FTN95 does not apply any locking automatically.
So you must work out any possible interference and apply locking accordingly.

I am assuming that you are using FTN95 .NET.

[MarzAttax]

No I am not using .NET

I merely wished to know if two separate threads simultaneously calling READF@ say, would cause a conflict. Perhaps in other words, assuming that the code for handling READF@ is in a single location, then without any "locking" in the READF@ code, there arises the possibility of conflict, and in that case I AM asking whether or not routines such as READF@ use "locking".
However, since I am not omniscient, there may be a way of overcoming this, perhaps something Salford/Silverfrost have done that would help me achieve my aim; but I find it difficult to ask directly since I do not know of it.

I am attempting to have multiple threads simultaneously read different files from a HDD/SDD.

Regards
Marz

[PaulLaidler]

The only way I know to do threading with Win32 FTN95 is to use the Windows API to call CreateThread etc. but then I would not know how to attempt locking etc.

I wonder if you really mean "threading" or do you mean "multi processing"?

[mecej4]