jpff wrote:

As we edge towards multiprocessor Csound we need to look at places in the code that need protection. I have protected memory allocation. Now looking at the channels; each channel needs a lock, but the GetChannelPtr function yields the data but not the structure that includes any lock. So either we need a largely redundant GetChannelLock or need to change GetChannelPtr to give the lock location as well as the data. Or have I missed some alternative? Any thoughts or ideas? ==John ffitch

I don't think it's up to the "user" to handle the lock.
I wouldn't make a Channel Ptr available either.
I would export a function called

res_type csoundSetParameter (param_name_type, param_value_type);

... csoundSetParameter...
{
    LOCK();

    //...

    UNLOCK();
}

int ret = csoundSetParameter("delay", 20);

#define PARAM_TYPE_VAL	1
#define PARAM_TYPE_REF	2

typedef struct _param
{
    int type,
    MYFLT val,
    MYFLT *ref,
    int count

} PARAM;


PARAM param;

param.type = PARAM_TYPE_VAL;
param.val = 20;

int ret = csoundSetParameter("delay", ¶m);

Fons Adriaensen-2 wrote:
> 
> On Thu, Feb 05, 2009 at 02:02:43PM -0800, Pinball wrote:
> 
> Which would mean a lot of back-to-back UNLOCK();LOCK() pairs
> if a users want to modifiy not one but a set of parameters,
> each pair potentially being two system calls.
> 


For bulk operations you can pass data by the "ref" pointer. 
That's why i provided the PARAM_TYPE_REF option. The 
Orchestra code should be able to define the parameters 
contiguously.

Ciao





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int ret = csoundSetParameter("delay", 20);

int param_index_delay = getParameterByName("Delay");
int param_index_gain = getParameterByName("Gain");

// start the performance
// ...

csoundSetParameter(param_index_delay, 20);
csoundSetParameter(param_index_gain, 0.7);