They take a pointer to a free-list used for hashlinks so the hashlink
pools can be per-thread. However, hash tables that are not updated are
always thread-safe, so this affects only updates. progs_t has been set
up such that it is easy for multiple progs within one thread can share
hashlinks.
This "pushes" a temp string onto the callee's stack frame after removing
it from the caller's stack frame. This is so builtins can pass
auto-freed memory to called progs code. No checking is done, but mayhem
is likely to ensue if a string is pushed that was allocated in an
earlier frame.
PR_AllocTempBlock() works the same way as PR_SetTempString(), except
that it takes a size parameter and always allocates (never tries to
merge). This is, in a way, abusing the string system, but I needed a way
to allocate a block of progs memory that would be automatically freed
when the current frame ended. The biggest abuse is the need to cast away
the const of PR_GetString()'s return value.
Rather than relying on progs code version, use the string to determine
whether PR_Sprintf should behave as if floats have been promoted through
... I imagine I'll get to the rest of the server code at some stage.
With these two changes, nq-x11 works again (teleporters were the
symptom).
With this, the VA is very close to being safe to use in a threaded
environment (so long as each VM is used by only one thread). Just the
debug file hash and source paths to sort out.
Only as scalars, I still need to think about what to do for vectors and
quaternions due to param size issues. Also, doubles are not yet
guaranteed to be correctly aligned.
add no_exec_limit field. Set to 1 to disable the runaway loop check
for unlimited runs (eg, in qwaq)
pr_exec.c:
don't bother checking the profile counter if pr->no_exec_limit is set
pr_strings.c:
free unreferenced dynamic strings rather than referenced.
external to the progs file are now malloced and then freed at progs reload.
All that needs to be implementd for gc to work is the scanner and deallocator.
Bill Currie
Adam Olsen