Note that conditional compilation may be necessary to accommodate both the user threads and the kernel threads interfaces, as in the above example. An alternative might be to compose a buffer with an ostrstream and output with one write. The following example could be used with the cfront compatiblelibstream:

ostrstream ostr;

ostr << “something” /*...*/ ;

ostr << “ or another” /*...*/ << endl; cout.write(ostr.str(), ostr.pcount()); ostr.rdbuf()->freeze(0);

Note that the above example works with the new library, though with the deprecated ostrstream.

Or something similar can be done with the Rogue Wave Standard C++ Library 2.2.1 (libstd_v2) with standard ostringstream, as in the following example:

ostringstream ostr;

ostr << “something” /*...*/ ;

ostr << “ or another” /*...*/ << endl; cout.write(ostr.str().c_str(), ostr.str().length());

Note that cout.flush may be needed if sharing the file with stdio.

Required Command-line Options

To use the multi-thread safe capabilities of the Standard C++ Library, you need to specify the following options at both compile and link time. Note that the options differ depending on which set of libraries you are using.

Rogue Wave Standard C++ Library 2.2.1

For both 32-bit and 64-bit libraries:

•-D_RWSTD_MULTI_THREAD

•-D_REENTRANT

•-lpthread(This option applies only to kernel threads.)

•-mt

Rogue Wave Standard C++ Library 1.2.1 and Tools.h++ 7.0.6

For both 32-bit and 64-bit libraries:

•-D__HPACC_THREAD_SAFE_RB_TREE(Code compiled with this option is binary incompatible with code that is not compiled with this option. Only HP aC++ version A.01.21 and subsequent versions incorporate this option.)

•-DRWSTD_MULTI_THREAD

•-DRW_MULTI_THREAD(needed only for the Tools.h++ Library)

•-D_REENTRANT

•-lcma(This option applies only to user threads.)

•-lpthread(This option applies only to kernel threads.)

•-D_THREAD_SAFE(Unlike the other options in this table, this option is not required. You can use it with the cout, cin, cerr, and clog objects, if you are not using locks.)

•-mt

NOTE: If you do not specify these options as described in both cases, a runtime error will be generated or multi-thread behavior will be incorrect. If you use +Oopenmp in an application, you must use -mton files that are not compiled with +Oopenmp.

164 Exception Handling