Legacy ImageMagick Discussions Archive

I'm on Linux.

[fsdevops@localhost lib64]$ Magick++-config --ldflags --libs
-lMagick++-6.Q16 -lMagickWand-6.Q16 -lMagickCore-6.Q16
-lMagick++-6.Q16 -lMagickWand-6.Q16 -lMagickCore-6.Q16

[fsdevops@localhost lib64]$ ldd libMagick++-6.Q16.so
linux-vdso.so.1 (0x00007fffccda6000)
libMagickWand-6 ...

I want to deal a lot of image in parallel.
how can i do that efficiently?
thanks.

i read a small image,40X40,but didn`t get 'enter Thread ID' intermixed with 'Thread ID'.
i find this code in github:
void Magick::Image::write(Blob *blob_)
{
size_t
length=0;

void
*data;

modifyImage();
GetPPException;
data=[b]ImagesToBlob(constImageInfo(),image(),&length,exceptionInfo);[/b ...

the output is:

enter Thread ID: 139942202099456
enter Thread ID: 139942193706752
Thread ID: 139942202099456execute time:422.408
Thread ID: 139942193706752execute time:388.353

but if i set #define NUM_THREADS 20
the output is:

enter Thread ID: 140502406002432
enter Thread ID: 140502397609728 ...

here is my code:

#include <Magick++.h>
#include <iostream>
#include <unistd.h>
#include <time.h>
#include <pthread.h>
using namespace std;
using namespace Magick;
#define NUM_THREADS 2

void *testGM(void *ptr)
{
long tid= pthread_self();
cout << "enter Thread ID: " << tid << endl;

Image ...

1. Blob blob(data,len);
2. Image image(blob);
code above running in Multi-thread,Line 2 will run sequentially. is because image(blob) is a I/O operation and blocked？
i need deal with a lot of pictures，may i deal with them concurrently？

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