ucontext -- user thread context
Standard C Library (libc, -lc)
The ucontext_t type is a structure type suitable for holding the context
for a user thread of execution. A thread's context includes its stack,
saved registers, and list of blocked signals.
The ucontext_t structure contains at least these fields:
ucontext_t *uc_link context to assume when this one returns
sigset_t uc_sigmask signals being blocked
stack_t uc_stack stack area
mcontext_t uc_mcontext saved registers
The uc_link field points to the context to resume when this context's
entry point function returns. If uc_link is equal to NULL, then the
process exits when this context returns.
The uc_mcontext field is machine-dependent and should be treated as
opaque by portable applications.
The following functions are defined to manipulate ucontext_t structures:
int getcontext(ucontext_t *);
int setcontext(const ucontext_t *);
void makecontext(ucontext_t *, void (*)(void), int, ...);
int swapcontext(ucontext_t *, const ucontext_t *);
sigaltstack(2), getcontext(3), makecontext(3)
FreeBSD 5.2.1 September 10, 2002 FreeBSD 5.2.1 [ Back ]