Op Wed, 23 Jun 2010, schreef Graeme Geldenhuys:
Op 2010-06-22 15:31, Marco van de Voort het geskryf:
Same problem. You still have to interface with the kernel, and it would be
incompatible with C libraries that use threads.
Well, if I don't use C libraries (only Object Pascal code), then it should
still be beneficial. I can then write pure Object Pascal code/applications
and still have multi-threading support.
It's not just about eliminating libc dependencies. I believe it would be
beneficial in most cases, even when using C libraries, since the Linux
kernels does not expose a Posix threads like API, Posix threads are
emulated. The FPC model is again unlike the Posix model, so you have again
glue code. Directly calling the kernel would remove this overhead and
allow for more efficient threading.
The fact that the C libraries you call are written for libpthread does not
need to be a problem:
- You would not be able to share a variable between
Pascal and C and have threads in both worlds wait on each other and two
threads may not be able to call C code at the same time, you would
need to protect that.
- However, C libraries could safely launch pthread based threads without
getting in the wheels of Pascal based threads.
Daniël
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