Comtrol eCos - Manual (Page 54)

Per-thread data
never include the POSIX compatibility package then application code may instead decide to re-use the slot allo-
cated to that package,
CYGNUM_KERNEL_THREADS_DATA_POSIX , but obviously this does involve a risk of strange
and subtle bugs if the application’s requirements ever change.
Valid contexts
Typically cyg_thread_new_data_index is only called during initialization, but may also be called at any time
in thread context. cyg_thread_free_data_index , if used at all, can also be called during initialization or from
thread context. cyg_thread_get_data , cyg_thread_get_data_ptr , and cyg_thread_set_data may only be
called from thread context because they implicitly operate on the current thread.
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