[Qt-interest] QScriptEngine: "Could not allocate register file: 12"

[Thiago Macieira]

Em Quinta-feira 06 Maio 2010, às 09:56:30, Pedro Santos escreveu:
> Am 05.05.2010 23:00, schrieb Frank Mertens:
> > When I remember right the script engine is doing some memory mapping
> > for its "register file". So, my guess is, you are running out of address
> > space for memory mapping. The question is of course, why you need
> > hundreds of script engines running at the same time. If you really need
> > this maybe you check the compiler flags for the Qt libs. There is a flag
> > to disable the JIT and maybe it takes less resource that way.
> 
> I don't really need that many script engines. But I would like to
> understand what this error means. Thank you for the hint with the JIT, I
> will try it out and see what happens.

Grep the Qt sources for that string and find out where the 12 comes from.

They all come from 
src/3rdparty/javascriptcore/JavaScriptCore/interpreter/RegisterFile.h, like 
this:

        m_buffer = reinterpret_cast<Register*>(mmap(0, bufferLength, PROT_READ|
PROT_WRITE, MAP_PRIVATE|MAP_ANON, VM_TAG_FOR_REGISTERFILE_MEMORY, 
0));
        if (m_buffer == MAP_FAILED) {
#if OS(WINCE)
            fprintf(stderr, "Could not allocate register file: %d\n", 
GetLastError());
#else
            fprintf(stderr, "Could not allocate register file: %d\n", errno);
#endif
            CRASH();
        }

And as someone suspected, 12 is the errno and on Linux:

#define ENOMEM          12      /* Out of memory */

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
      PGP/GPG: 0x6EF45358; fingerprint:
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