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#
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# set -o noglob is assumed.
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# WARNING: ex_pkg_dispatch(), its caller, and its callers must _NOT_ be executed
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# as part of conditional evaluation, e.g. if, until, while, !, or && and ||, as
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# doing so would inhibit set -o errexit during execution of this function and its
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# subshell(!).  Instead, call ex_pkg_dispatch() and subsequently evaluate ${?}.
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#
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exp_pkg_dispatch() {
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	local _pkg_name="${1}" _tgt_name="${2}" _restart_at="${3}"				\
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		_dispatch_fn="${4}" _stderrout_path="${5}" _pipe_path="${6}"			\
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		_njobs_vname="${7}" _pkg_name_uc;
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	_pkg_name_uc="$(ex_rtl_toupper "${_pkg_name}")";
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	if [ -n "$(ex_rtl_get_var_unsafe PKG_${_pkg_name_uc}_DISABLED)" ]; then
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		"${_dispatch_fn}" disabled_pkg "${_pkg_name}" "${_tgt_name}";
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	elif ex_pkg_state_test "${_pkg_name}" finish\
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	&& [ -z "${_restart_at}" ]; then
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		"${_dispatch_fn}" skipped_pkg "${_pkg_name}" "${_tgt_name}";
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	else
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		_stderrout_path="${BUILD_WORKDIR}/${_pkg_name}_stderrout.log";
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		"${_dispatch_fn}" start_pkg "${_pkg_name}" "${_tgt_name}";
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		(set -o errexit -o noglob; BUILD_IS_PARENT=0;
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		ex_pkg_env "${_pkg_name}" "${_tgt_name}" "${_restart_at}";
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		trap "if [ \${?} -eq 0 ]; then							\
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			echo \"done ${_pkg_name} ${_tgt_name}\" >&3;				\
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		      else									\
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			echo \"fail ${_pkg_name} ${_tgt_name}\" >&3;				\
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		      fi;" EXIT HUP INT TERM USR1 USR2;
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		ex_pkg_exec "${_pkg_name}" "${_tgt_name}" "${_restart_at}"			\
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			"${_dispatch_fn}";) 1>"${_stderrout_path}" 2>&1 3>"${_pipe_path}" &
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		: $((${_njobs_vname}+=1));
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	fi;
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};
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ex_pkg_dispatch() {
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	local _tgt_name="${1}" _restart="${2}" _restart_at="${3}"				\
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		_dispatch_fn="${4}" _tgt_name_uc						\
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		_pkg_names _njob _njobs _njobs_max						\
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		_pipe_path _stderrout_path _pipe_msg _script_rc;
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	ex_rtl_fileop mkdir "${BUILD_WORKDIR}";
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	_pipe_path="${BUILD_WORKDIR}/build.fifo";
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	_tgt_name_uc="$(ex_rtl_toupper "${_tgt_name}")";
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	"${_dispatch_fn}" start_target "" "${_tgt_name}";
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	_pkg_names="$(ex_rtl_get_var_unsafe ${_tgt_name_uc}_PACKAGES)";
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	if [ -n "${_restart}" ]\
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	&& [ "${_restart}" != ALL ]; then
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		_pkg_names="$(ex_rtl_lfilter "${_pkg_names}" "${_restart}")";
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	fi;
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	if [ "$(ex_rtl_get_var_unsafe ${_tgt_name_uc}_PARALLELISE)" = 1 ]\
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	&& [ "${ARG_PARALLEL:-0}" -gt 1 ]; then
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		_njobs_max="${DEFAULT_BUILD_CPUS}";
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	else
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		_njobs_max=1;
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	fi;
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	set -- ${_pkg_names};
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	while [ ${#} -gt 0 ]; do
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		_script_rc=0; _njobs=0;
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		ex_rtl_fileop mkfifo "${_pipe_path}";
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		for _njob in $(seq 1 $((${_njobs_max}-${_njobs}))); do
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			if [ ${#} -eq 0 ]; then
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				break;
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			else
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				exp_pkg_dispatch "${1}" "${_tgt_name}"				\
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					"${_restart_at}" "${_dispatch_fn}"			\
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					"${_stderrout_path}" "${_pipe_path}"			\
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					_njobs; shift;
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			fi;
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		done;
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		if [ "${_njobs:-0}" -gt 0 ]; then
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			while read _pipe_msg; do
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			case "${_pipe_msg%% *}" in
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			done)	"${_dispatch_fn}" finish_pkg ${_pipe_msg#done };
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				: $((_njobs-=1));
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				for _njob in $(seq 1 $((${_njobs_max}-${_njobs}))); do
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					if [ ${#} -eq 0 ]; then
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						break;
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					else
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						exp_pkg_dispatch "${1}" "${_tgt_name}"		\
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							"${_restart_at}" "${_dispatch_fn}"	\
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							"${_stderrout_path}" "${_pipe_path}"	\
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							_njobs; shift;
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					fi;
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				done;
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				if [ "${_njobs:-0}" -eq 0 ]; then
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					break;
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				fi; ;;
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			fail)	_script_rc=1;
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				"${_dispatch_fn}" fail_pkg ${_pipe_msg#fail };
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				[ $((_njobs-=1)) -eq 0 ] && break; ;;
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			step)	"${_dispatch_fn}" step_pkg ${_pipe_msg#step }; ;;
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			esac; done <>"${_pipe_path}";
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		fi;
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		ex_rtl_fileop rm "${_pipe_path}";
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		if [ "${_script_rc:-1}" -eq 1 ]; then
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			return "${_script_rc}";
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		fi;
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	done;
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	"${_dispatch_fn}" finish_target "" "${_tgt_name}";
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};
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# vim:filetype=sh