Link Old With New (Multithreaded Programming Guide)

Multithreaded Programming Guide

Link Old With New

Table 7–2 shows that multithreaded object modules should be linked with old object modules only with great caution.

Table 7–2 Compiling With and Without the _REENTRANT Flag


The File Type	Compiled	Reference	And Return
Old object files (nonthreaded) and new object files	Without the `_REENTRANT` or `_POSIX_C_SOURCE` flag	Static storage	The traditional `errno`
New object files	With the `_REENTRANT` or `_POSIX_C_SOURCE` flag	`__errno`, the new binary entry point	The address of the thread's definition of `errno`
Programs using TLI in libnsl [Include `tiuser.h` to get the TLI global error variable. ]	With the `_REENTRANT` or `_POSIX_C_SOURCE` flag (required)	`__t_errno`, a new entry point	The address of the thread's definition of `t_errno`.